Jake Lamb homered leading off the bottom of the seventh inning, sparking a three-run rally, and the Oakland Athletics defeated the visiting Seattle Mariners 6-2 Sunday afternoon in their regular-season finale.

The A's (36-24) had already clinched the American League West title. The Mariners (27-33) finished third in the division.

Lamb's homer to left-center field came on a 2-1 count against Seattle right-hander Yoshihisa Hirano (0-1) and broke a 2-2 tie.

Sean Murphy followed by drawing a walk, and an out later, Tony Kemp doubled to right. Chad Pinder walked to load the bases before Mark Canha doubled to center to bring home two runs.

Canha drew a bases-loaded walk with two outs in the eighth for his fourth RBI of the day.

A's right-hander Yusmeiro Petit (2-1) got the victory with a scoreless inning of relief.

Oakland right-hander Frankie Montas, who had a 10.88 ERA over his previous six starts, gave up just two runs (both unearned) in six innings. Montas allowed four hits, walked two and struck out a career-high 13.

Mariners lefty Marco Gonzales went five innings and allowed two runs on six hits with one walk and five strikeouts.

The Mariners scored unearned runs in each of the first two innings to take a 2-1 lead.

J.P. Crawford led off the game with a single and reached second when shortstop Marcus Semien couldn't handle the throw from catcher Murphy on a stolen-base attempt. With two outs, Ty France lined a run-scoring single to left.

The A's tied it in the bottom of the inning as Tommy La Stella doubled to left with one out, moved to third on a single by Khris Davis and scored when Canha grounded into a forceout.

The Mariners regained the lead in the second. Jose Marmolejos drew a leadoff walk, and one out later, Braden Bishop reached on a fielding error by third baseman Lamb. Marmolejos scored from second on Crawford's two-out single to right.

The score remained 2-1 until the bottom of the fifth. Murphy led off with a double to center field, moved to third on Semien's flyout to right and scored on Pinder's two-out single to right.

--Field Level Media