Breslow, who made $425,000 in 2010, can also earn up to $25,000 in incentives based on the number of games finished.
The 30-year-old originally filed for arbitration at $1.55 million last week, while the A's countered with $1.15 million. He represented the last of Oakland's arbitration-eligible players, as the A's continue its long-standing history of avoiding arbitration hearings.
Breslow is coming off the strongest campaign of his career, one which resulted in a team-leading 75 appearances -- a number that ranked second among all American League relievers. In 74 2/3 innings, which ranked fourth in the AL, Breslow registered a 3.01 ERA and set an Oakland record for strikeouts by a left-handed reliever with 71.
His presence was key down the stretch, as the A's battled multiple injury woes in the bullpen, most notably in the form of closer Andrew Bailey (right elbow) and Jerry Blevins (left hip/shoulder) and Michael Wuertz (left thumb).
Breslow is slated to join that trio, along with newcomers Brian Fuentes and Grant Balfour and familiar faces Brad Ziegler and Joey Devine, in forming one of the league's most feared relief corps this year.