Grant Balfour saved his 41st consecutive game Monday night, breaking Dennis Eckersley's all-time franchise record.
Balfour, 35, has now converted all 23 of his save opportunities this season.
In three years with the A's he has converted 48 of 55 save opportunities.
Eckersley recorded his 40 straight saves from Sept. 15, 1991 to Aug. 7, 1992. The 1992 Cy Young Award winner and American League MVP saved 320 of his 324 games for the A's over nine years in Oakland. Eckersley went 197-171 with a 3.50 ERA and 2,401 strikeouts to 738 walks over his 24-year, Hall-of-Fame career.