What Is a Quality Start in Baseball?

A quality start has two requirements that must both be true in the same start:

• Innings pitched: 6.0 or more (any partial inning short of six full innings disqualifies the start)
• Earned runs allowed: 3 or fewer (unearned runs from errors do not count toward the limit)

The official MLB glossary defines it this way: a starting pitcher records a quality start when he pitches at least six innings and allows three earned runs or fewer. MLB's standard stats glossary(opens in new tab) is the official source.

Earned vs. Unearned Runs

Only earned runs count against the QS threshold. If your starter gives up four total runs but two were unearned (because of errors that should have ended the inning), the official scorer credits him with two earned runs and the start can still qualify as a quality start. The baseball scorecard has dedicated columns for ER and R precisely so this distinction stays clean during the game.

Why Starting Pitchers Only

Quality starts apply only to the pitcher who begins the game. Relief pitchers are excluded because the six-inning minimum is structurally out of reach in a single appearance. Bullpen games and openers create edge cases: an opener who throws one inning is the official starting pitcher in the box score, but he has no chance at a QS. The bulk reliever who follows him also cannot earn one because he was not the starter.

No. Seven innings with four earned runs is not a quality start. The earned-run cap is three, and that limit does not flex upward when the pitcher works deeper into the game. The line is binary: 3 ER or fewer in 6+ IP earns the QS, and 4 ER at any inning total disqualifies it.

Common Borderline Cases

The 6.0 IP / 3 ER line is the floor of the stat, which is why some critics argue it sets too low a bar. A pitcher who hits the floor exactly posts a 4.50 ERA for that outing, well above the modern league average. The next section breaks down why that ceiling matters.

The highest game ERA a pitcher can post and still record a quality start is 4.50. That number comes from allowing exactly three earned runs over six innings: (3 ER × 9 IP) / 6 IP = 4.50. Any deeper outing with three earned runs produces a lower game ERA, and any outing with four or more earned runs disqualifies the start no matter how long it lasts.

Game ERA at the QS Floor

The 4.50 ceiling is the strongest argument against the stat. A starter who posts a 4.50 ERA across a full season is below average by modern standards (the MLB-wide ERA usually sits between 4.00 and 4.30). For a deeper view of pitcher rate stats, the ERA calculator breaks down earned run average across 6, 7, and 9 inning formats, and the WHIP calculator covers baserunner traffic. Defenders of QS counter that the floor is rarely the average outcome: across the 1984 to 1991 sample period when the stat first caught on, the average ERA during quality starts was just 1.91, well below the 4.50 ceiling. Most QS outings are excellent; the floor only becomes a problem when teams use the rate as their main pitcher ranking.

Alternatives to the Quality Start

Analysts and former players have proposed stricter variants that tighten the 4.50 ERA floor. None have replaced QS in official MLB tracking, but each surfaces in pitching analysis when writers want a higher bar:

• High quality start (Nolan Ryan): 7 or more innings pitched with 3 earned runs or fewer. Raises the inning threshold by one full frame, which drops the maximum allowable game ERA from 4.50 to 3.86.
• Dominant start (Dayn Perry): 8 or more innings pitched with 1 earned run or fewer. A much tighter bar that functionally requires ace-level outings and caps game ERA at 1.13.
• Money start (John Laghezza): A variant that adjusts the IP and ER thresholds, designed as a stricter standard than QS but looser than Perry's dominant start.
• Plus start (John Laghezza): A companion metric to the money start, setting a mid-tier threshold for outings that beat QS but fall short of dominant-start criteria.

These alternatives are useful when comparing aces, because a standard QS rate compresses differences at the top of the distribution. A pitcher at 70% QS and a pitcher at 65% QS can look close on paper, but if one records twice as many high quality starts, the gap in outing-level value is much wider than the binary QS line suggests.

Don Sutton holds the all-time MLB record with 483 career quality starts, narrowly ahead of Nolan Ryan and Greg Maddux. The career leaderboard is dominated by durable, long-career starters whose value came from showing up every fifth day for two decades or more.

All-Time Career Quality Start Leaders

Every pitcher in the top ten pitched for at least two decades, a level of longevity that is essentially extinct in modern baseball. Today's top starters average 30 to 33 starts per year and rarely cross 200 innings, so career totals near 480 QS would require pitching effectively into a pitcher's mid-40s.

Nolan Ryan recorded 481 career quality starts across his 27-year MLB career. That total ranks second on the all-time list behind Don Sutton's 483 and just ahead of Greg Maddux's 480. Ryan's QS count is remarkable because he played in an era when teams left starters in much longer than they do today, but he also walked an enormous number of hitters (a record 2,795 career walks), which made his QS production a function of pure stuff and stamina rather than command.

How Ryan Compares to His Era

Ryan made 773 career starts, so his QS rate works out to roughly 62%. That puts him in the same general band as the other Hall-of-Fame durables on the leaderboard. The number sits just below Maddux's career QS rate (around 65%, on 480 QS in 740 starts) because Ryan's high walk totals occasionally pushed his pitch count up before he could reach the six-inning threshold or pile on extra runs in a single inning.

The single-season quality start record belongs to Jack Chesbro, who posted 44 quality starts for the New York Highlanders (now the Yankees) in 1904. Chesbro made 51 starts that season, completing 48 of them, in a deadball-era workload that no modern pitcher will approach. Pete Alexander recorded 40 QS in 1916, and Wilbur Wood's 37 in 1971 stands as the best modern-era total.

Single-Season QS Records

Modern starters average 30 to 33 starts per season, so anything above 25 QS in a year is an All-Star caliber number. The all-time single-season records will almost certainly stand forever; even a perfect-season starter making every fifth-day turn would top out around 32 to 34 quality starts.

Longest Consecutive Quality Start Streaks

Consecutive QS streaks show up alongside season totals on every leaderboard because they measure sustained excellence across every fifth-day turn. Three pitchers anchor the top of the list:

Gibson's 1968 streak came in a season so dominant that MLB lowered the mound the following year. The deGrom and Valdez streaks are more impressive given modern starter workloads, where an average outing ends closer to five innings and bullpen usage constantly pulls starters before the six-inning QS threshold.

MLB quality start leaders are tracked at both the pitcher and franchise level, and the team-by-team view usually favors clubs with long-tenured rotation aces. The Atlanta Braves, Los Angeles Dodgers, and Houston Astros have dominated team QS totals during the last decade of regular-season play because their rotations consistently protect five and six starters deep.

How to Read Team QS Leaderboards

Three angles matter when scanning team QS data:

• Total team QS: The simple sum of QS across every starter. Favors five-man rotations that stay healthy and avoid bullpen games.
• Team QS rate: Total QS divided by total team starts. Normalizes for rotation size and injury-driven spot starts, making it the best cross-team comparison.
• QS distribution: How the QS count is spread across the rotation. A staff with one 25-QS ace and four sub-50% arms is structurally weaker than a staff of four 60% starters.

Why Modern Team Totals Look Low

League-wide team QS totals have fallen since the mid-2010s because MLB starters now pitch fewer innings per outing. The average starter throws closer to 5.1 innings per start today versus 6.2 in the early 2000s, driven by analytics-led pitch-count limits and third-time-through-the-order penalties. That structural shift caps team QS ceilings at around 95 to 105 per season, far below historical norms where several clubs regularly crossed 120 team QS in a single year.

The Ohtani rule lets a starting pitcher who is also batting in the lineup as the designated hitter remain in the game as the DH after he is removed from the mound. MLB and the players' association added the exception for the 2022 season alongside the universal DH, and it was nicknamed for Shohei Ohtani because he was the only player at the time who regularly pitched and hit in the same start.

How the Rule Works in Practice

• The pitcher must be the starting pitcher and listed in the batting order as the DH
• When the manager pulls him from the mound, his bat stays in the lineup at the DH spot
• A reliever cannot keep the DH slot if he enters from the bullpen; the rule applies only to starters who also opened the game as the DH
• Without this exception, the team would have to forfeit the DH spot the moment the two-way starter exits as a pitcher

For coverage of the original 2022 rule change, see MLB's announcement of the agreement(opens in new tab).

Why It Matters for Quality Starts

The Ohtani rule does not change the QS definition at all. A two-way starter still needs 6 innings and 3 or fewer earned runs, and his offensive performance after leaving the mound has no impact on the pitching line. The rule does affect game strategy: a manager can pull Ohtani after exactly six innings (locking in the QS) knowing his bat stays available for a late-game at-bat, instead of choosing between an extra inning of pitching and a high-leverage plate appearance.

Quality Start Rate (QS%) is the simplest way to compare pitchers across different workloads. It divides quality starts by total games started: QS% = QS / GS. A starter with 22 QS in 32 starts has a 69% QS rate, which puts him in the elite tier of modern rotation arms.

QS Rate Benchmarks (Starting Pitchers)

QS rate works better than raw QS totals when comparing pitchers from different teams or seasons. A starter stuck on a six-man rotation will have fewer QS opportunities than a five-man rotation arm even if they pitch equally well, so the rate normalizes that gap.

All-Time Career QS% Leader

The career QS rate record (minimum 100 starts) belongs to Jeff Tesreau, a dead-ball era New York Giants starter who posted 149 quality starts in 207 career starts for a 72.0% career QS rate. Tesreau played from 1912 to 1918, pitching in an era when starters routinely went deep and run environments were low, conditions that inflate QS totals compared to modern baseball. No pitcher with a substantial modern-era career has approached 70% lifetime QS rate, which illustrates how environmental factors (run scoring, bullpen usage, pitch counts) shape the stat as much as raw pitcher quality.

Worked Example: A Full-Season Calculation

A college ace finishes the year with 18 quality starts in 24 starts. Plug the numbers into the formula:

QS% = 18 / 24 = 0.75 (75%)

A 75% rate is elite at any level. For coaches tracking pitcher development across a season, QS% combined with ERA and WHIP gives you the three-stat snapshot most front offices use to evaluate starters.

A quality start and a pitcher win measure different things. A win is awarded based on which team scored more runs while the pitcher was the pitcher of record, regardless of how he actually performed. A QS is purely a performance metric: 6 IP and 3 or fewer earned runs, no run support required. The two stats often disagree.

Tough Losses and Cheap Wins

ESPN popularized two related labels that explain the gap between QS and W:

• Tough Loss: A quality start that ends in a loss (the pitcher pitched well enough to win, but the offense did not score enough)
• Cheap Win: A non-quality start that ends in a win (the pitcher gave up too many runs but the offense bailed him out)

On low-scoring teams, a starter can post a 65% QS rate and still finish below .500, simply because his lineup fails to score enough runs in his outings. The 2017 Marlins bullpen and the 2019 Tigers rotation are recent examples where pitching performance and team wins decoupled badly. For a deeper look at how MLB scoring works on the run-support side, the baseball stat sheet includes the run-support columns that show why a pitcher's W-L record can mislead.

QS vs. Other Modern Pitcher Stats

QS works best as a workload indicator paired with rate stats. A pitcher with 25 QS, a 3.20 ERA, and a 1.12 WHIP is genuinely excellent. A pitcher with 25 QS but a 4.20 ERA and a 1.40 WHIP probably benefited from a favorable defense or sequencing luck that the binary QS line cannot capture. For total value, see WAR in baseball, which folds pitching, defense, and run environment into one number, and OPS in baseball for the offensive side that determines whether your starter's quality starts translate into team wins.

Quality start shows up in fantasy baseball products and video games because it is a clean, binary pitching line that rewards starters for length and damage control. On PrizePicks and similar pick'em apps, the QS prop pays out when the listed starter records a quality start in that outing. In MLB The Show (Road to the Show, Franchise, and Diamond Dynasty modes), the in-game stat engine tracks QS the same way MLB does: 6 IP and 3 ER or fewer.

QS in Pick'em and DFS Contexts

• PrizePicks and similar pick'em apps: QS is a binary yes/no projection. The app lists a starting pitcher with a QS "over" line; you pick whether he will or will not record one in that start.
• Daily fantasy (DraftKings, FanDuel): QS is typically worth bonus points on top of IP and ER scoring, reinforcing the value of a six-plus inning outing.
• Season-long roto leagues: Many leagues replaced Wins with QS as a counting category because QS ignores run support and measures pitcher performance directly.

QS in MLB The Show 25

MLB The Show 25 tracks quality starts the same way MLB does and surfaces the stat on the pitcher player card alongside wins, ERA, and WHIP. In Road to the Show, building a QS streak boosts progression and unlocks teammate perks; in Franchise, the CPU uses QS rate in its rotation-health and trade-value calculations. The QS definition in-game is identical to the real one, so a 6.0 IP / 3 ER outing on PS5 credits the same QS entry as a live MLB start.

Tracking quality starts on a high school, college, or club roster is straightforward because the data lives in your scorebook already. After every start, log innings pitched and earned runs. If both columns clear the QS thresholds, mark a 1; otherwise mark a 0. Sum the column at the end of the season and divide by total starts for QS%.

What QS Tells You About a Young Pitcher

For amateur pitchers, the six-inning threshold is often artificially capped by pitch counts and league rules. NFHS-sanctioned high school games are seven innings, and most state associations cap pitch counts between 95 and 120 per outing. That structure means a freshman starter who pitches six innings of three-run ball has delivered nearly as much as the rules allow, while a varsity ace might be pulled at 100 pitches even with a shutout in progress. Reading QS in that context requires noting whether the pitcher reached the inning threshold by performance or by pitch-count rule.

Pairing QS With Practice Evaluation

A QS rate trend gives you a simple progress signal across a season. If a starter's QS% climbs from 40% in April to 65% by June, he is either developing command or learning to manage damage in big innings. Connecting that game data with the drill work behind it is where coaches separate noise from real growth. Pairing game stats with structured athlete evaluations from practice gives you the context that a binary QS line cannot.

Building those observations into a structured athlete development plan turns scattered scorebook entries into a season-long picture of each pitcher's growth. Platforms like Striveon let you log innings, earned runs, walks, and pitch counts alongside practice notes, so QS trends connect directly to the work happening between starts.