Player stats

Quality Start Percentage 2021

The percentage of a pitcher's starts that qualify as quality starts. Read this alongside the number of starts.

Season

Minimum workload: one inning pitched per game. Completed seasons use the league's scheduled regular-season game count; seasons in progress use team games played. This is a general pitching minimum, not a relief-pitcher qualification rule. Data through December 31, 2021. Data refreshed Sep 12, 2026, 7:39 AM UTC.

No. 1 / Quality Start Percentage / 2021

Walker Buehler

LAD

81.8%

Season leader

Quality Start Percentage2021 season
#	Player	Team	IP	BF	GS	QS%
1	W. BuehlerWalker Buehler	LAD	207.2	815	33	81.8%
2	R. RayRobbie Ray	TOR	193.1	773	32	71.9%
3	S. AlcantaraSandy Alcantara	MIA	205.2	837	33	69.7%
4	A. WainwrightAdam Wainwright	STL	206.1	828	32	68.8%
5	M. FriedMax Fried	ATL	165.2	667	28	67.9%
6	B. WoodruffBrandon Woodruff	MIL	179.1	708	30	66.7%
7	C. BurnesCorbin Burnes	MIL	167.0	657	28	64.3%
8	K. GibsonKyle Gibson	PHI	182.0	754	30	63.3%
9	Z. WheelerZack Wheeler	PHI	213.1	849	32	62.5%
10	F. MontasFrankie Montas	OAK	187.0	778	32	62.5%
11	K. GausmanKevin Gausman	SF	192.0	775	33	60.6%
12	M. ScherzerMax Scherzer	LAD	179.1	693	30	60.0%
13	G. ColeGerrit Cole	NYY	181.1	726	30	60.0%
14	K. HendricksKyle Hendricks	CHC	181.0	785	32	59.4%
15	C. MortonCharlie Morton	ATL	185.2	756	33	57.6%
16	L. CastilloLuis Castillo	CIN	187.2	803	33	54.5%
17	L. McCullers Jr.Lance McCullers Jr.	HOU	162.1	684	28	53.6%
18	W. MileyWade Miley	CIN	163.0	690	28	53.6%
19	J. BerríosJosé Berríos	TOR	192.0	781	32	53.1%
20	G. MárquezGermán Márquez	COL	180.0	756	32	53.1%
21	Z. GreinkeZack Greinke	HOU	171.0	697	29	51.7%
22	M. StromanMarcus Stroman	NYM	179.0	730	33	48.5%
23	A. DeSclafaniAnthony DeSclafani	SF	167.2	676	31	48.4%
24	J. MusgroveJoe Musgrove	SD	181.1	748	31	48.4%
25	L. GiolitoLucas Giolito	CWS	178.2	720	31	48.4%
26	C. FlexenChris Flexen	SEA	179.2	741	31	48.4%
27	S. ManaeaSean Manaea	OAK	179.1	754	32	46.9%
28	C. IrvinCole Irvin	OAK	178.1	768	32	46.9%
29	Y. DarvishYu Darvish	SD	166.1	681	30	43.3%
30	J. LylesJordan Lyles	TEX	180.0	769	30	43.3%
31	H. Jin RyuHyun Jin Ryu	TOR	169.0	701	31	41.9%
32	P. CorbinPatrick Corbin	WSH	171.2	751	31	41.9%
33	J. UríasJulio Urías	LAD	185.2	745	32	40.6%
34	N. EovaldiNathan Eovaldi	BOS	182.1	764	32	40.6%
35	T. MahleTyler Mahle	CIN	180.0	759	33	36.4%
36	T. AndersonTyler Anderson	SEA	167.0	703	31	35.5%
37	A. NolaAaron Nola	PHI	180.2	749	32	34.4%
38	D. CeaseDylan Cease	CWS	165.2	708	32	31.3%
39	D. KeuchelDallas Keuchel	CWS	162.0	720	30	30.0%

QS%: The percentage of a pitcher's starts that qualify as quality starts. Read this alongside the number of starts.

Understanding Quality Start Percentage

The percentage of a pitcher's starts that qualify as quality starts. Read this alongside the number of starts.

Formula: 100 × QS ÷ GS

Read rates alongside playing time. A small sample can produce an extreme result, and a missing value is different from zero.

Season rankings use regular-season records. A player has one combined row across teams; the team label identifies the associated team, not a separate team stint.

Source: MLB statistics and MLBDB derived measures. Formulas describe the measure above. Data refreshed Sep 12, 2026, 7:39 AM UTC.