Philadelphia Athletics Winning Percentage Leaders

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

Philadelphia Athletics records →

The single-season record is .313, by Lon Knight in 1876.

ERA W SO SV WHIP IP K/9 BB/9 K/BB SHO CG GS G L BB W-L%

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 Philadelphia Athletics leaders

Career totals with the club

No qualifying careers on record.

Single-season Philadelphia Athletics records

Best seasons in club history

#	Player	Season	W-L%	G
1	Lon Knight	1876	.313	34
2	George Zettlein	1876	.167	28