Player stats

Quality Start Percentage 2020

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, 2020. Data refreshed Sep 12, 2026, 7:39 AM UTC.

No. 1 / Quality Start Percentage / 2020

Shane Bieber

CLE

83.3%

Season leader

Quality Start Percentage2020 season
#	Player	Team	IP	BF	GS	QS%
1	S. BieberShane Bieber	CLE	77.1	297	12	83.3%
2	Y. DarvishYu Darvish	CHC	76.0	297	12	83.3%
3	T. BauerTrevor Bauer	CIN	73.0	278	11	81.8%
4	L. LynnLance Lynn	TEX	84.0	344	13	76.9%
5	Z. GallenZac Gallen	AZ	72.0	291	12	75.0%
6	K. HendricksKyle Hendricks	CHC	81.1	315	12	75.0%
7	C. CarrascoCarlos Carrasco	CLE	68.0	280	12	75.0%
8	K. MaedaKenta Maeda	MIN	66.2	248	11	72.7%
9	A. WainwrightAdam Wainwright	STL	65.2	262	10	70.0%
10	G. MárquezGermán Márquez	COL	81.2	344	13	69.2%
11	K. FreelandKyle Freeland	COL	70.2	304	13	69.2%
12	J. deGromJacob deGrom	NYM	68.0	268	12	66.7%
13	G. ColeGerrit Cole	NYY	73.0	288	12	66.7%
14	L. GiolitoLucas Giolito	CWS	72.1	288	12	66.7%
15	Z. WheelerZack Wheeler	PHI	71.0	288	11	63.6%
16	F. ValdezFramber Valdez	HOU	70.2	288	10	60.0%
17	H. Jin RyuHyun Jin Ryu	TOR	67.0	275	12	58.3%
18	L. CastilloLuis Castillo	CIN	70.0	292	12	58.3%
19	A. NolaAaron Nola	PHI	71.1	289	12	58.3%
20	A. CivaleAaron Civale	CLE	74.0	312	12	58.3%
21	M. GonzalesMarco Gonzales	SEA	69.2	277	11	54.5%
22	D. BundyDylan Bundy	LAA	65.2	267	11	54.5%
23	P. CorbinPatrick Corbin	WSH	65.2	295	11	54.5%
24	D. LametDinelson Lamet	SD	69.0	267	12	50.0%
25	Z. DaviesZach Davies	SD	69.1	276	12	50.0%
26	A. SenzatelaAntonio Senzatela	COL	73.1	303	12	50.0%
27	M. ScherzerMax Scherzer	WSH	67.1	295	12	50.0%
28	B. WoodruffBrandon Woodruff	MIL	73.2	293	13	46.2%
29	D. KeuchelDallas Keuchel	CWS	63.1	257	11	45.5%
30	C. BassittChris Bassitt	OAK	63.0	261	11	45.5%
31	A. MillsAlec Mills	CHC	62.1	252	11	45.5%
32	Z. GreinkeZack Greinke	HOU	67.0	273	12	41.7%
33	J. BerríosJosé Berríos	MIN	63.0	271	12	33.3%
34	A. HeaneyAndrew Heaney	LAA	66.2	279	12	33.3%
35	J. LesterJon Lester	CHC	61.0	265	12	33.3%
36	K. GibsonKyle Gibson	TEX	67.1	301	12	33.3%
37	B. SingerBrady Singer	KC	64.1	263	12	25.0%
38	M. PérezMartín Pérez	BOS	62.0	262	12	25.0%
39	J. CuetoJohnny Cueto	SF	63.1	277	12	25.0%
40	M. BoydMatthew Boyd	DET	60.1	271	12	25.0%

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.