Kansas City Royals Winning Percentage Leaders

Career totals with the Royals and the best single seasons in club history. Records run through the 2025 season.

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Al Fitzmorris holds the Royals career record with .593 winning percentage. The single-season record is .800, by Danny Duffy in 2016.

Rate records use the league's own minimums: a season needs the standard 1.0 inning per team game with the club, a career 1,000+ innings pitched with the club.

All-time Royals leaders

Career totals with the club

#	Player	With the club	W-L%	G
1	Al Fitzmorris	1969–1976	.593	243
2	LG Larry Gura	1976–1985	.587	310
3	Bret Saberhagen	1984–1991	.585	252
4	Dennis Leonard	1974–1986	.576	312
5	Steve Busby	1972–1980	.565	167
6	Kevin Appier	1989–2004	.556	287
7	Charlie Leibrandt	1984–1989	.555	194
8	Paul Splittorff	1970–1984	.537	429
9	Tom Gordon	1988–1995	.527	274
10	Danny Duffy	2011–2021	.500	234
11	Mark Gubicza	1984–1996	.494	382
12	Dick Drago	1969–1973	.466	182
13	Zack Greinke	2004–2023	.420	266

Single-season Royals records

Best seasons in club history

#	Player	Season	W-L%	G
1	Danny Duffy	2016	.800	42
1	LG Larry Gura	1978	.800	35
3	Bret Saberhagen	1989	.793	36
4	Bret Saberhagen	1985	.769	32
5	David Cone	1994	.762	23
6	Paul Splittorff	1977	.727	37
7	Mark Gubicza	1988	.714	35
8	Kevin Appier	1993	.692	34
9	Al Fitzmorris	1974	.684	34
10	Dennis Leonard	1975	.682	32
11	Zack Greinke	2009	.667	33
11	Mark Gubicza	1986	.667	35
13	Tom Gordon	1989	.654	49
13	Charlie Leibrandt	1985	.654	33
15	Kevin Appier	1992	.652	30
15	Mike Hedlund	1971	.652	32
17	Roger Nelson	1972	.647	34
18	Dennis Leonard	1980	.645	38
18	Paul Splittorff	1973	.645	38
20	LG Larry Gura	1980	.643	36
20	Bret Saberhagen	1987	.643	33
22	Seth Lugo	2024	.640	33
23	Rich Gale	1978	.636	31
23	James Shields	2014	.636	34
25	Dennis Leonard	1976	.630	35