Matt Chapman homered early, Frankie Montas won his third straight start and the A's beat the Chicago White Sox 5-1 to snap a four-game losing streak.

Montas (12-9) allowed one run and six hits with seven strikeouts and two walks in seven sparkling innings. He had lost his only previous regular-season appearance against the White Sox last month.

Chad Pinder drove in a run with a sixth-inning triple. Yan Gomes and Elvis Andrus each had an RBI single for the A's, who drew a crowd of 8,147 as they try to stay in the playoff race.

Oakland got to Dallas Keuchel (8-9) early, and the Chicago lefty saw his losing streak reach three games during a four-start winless stretch since he beat Montas on Aug. 16. Keuchel allowed five runs on eight hits over 5 2/3 innings with three strikeouts and a walk.

Eloy Jimenez severely bruised his right knee when he was hit by a foul ball while sitting in the dugout during the second inning Tuesday night and is day to day. Jimenez stayed in the game initially before a slide into home plate in the fifth increased his knee pain and he exited.

Reynaldo Lopez (3-1, 2.08 ERA) pitches for the White Sox seeking his first win in the last three starts. Oakland LHP Sean Manaea (8-9, 3.91) is 0-3 with an 8.00 ERA and nine home runs allowed over his past six starts.