PHOENIX (AP) — Adam Eaton tripled to spark a three-run fifth inning and the Arizona Diamondbacks rallied to beat the San Diego Padres 6-2 on Wednesday night.

Dan Wheeler had an RBI triple, and Miguel Montero and Paul Goldschmidt added run-scoring doubles for the Diamondbacks, who have won three straight. Arizona remained 4 1-2 games behind St. Louis for the second NL wild card.

Arizona starter Trevor Cahill (12-11) went six innings, allowing two runs and five hits with four walks and four strikeouts.

Max Venable and John Baker had consecutive RBI singles for the Padres, who have lost two straight to the Diamondbacks after winning eight of their previous nine against them.

Padres starter Edinson Volquez (10-11) gave up four runs and eight hits over six innings. He struck out five and did not walk a hitter for the first time since Sept. 25, 2006 for Texas against the Los Angeles Angels, a span of 108 starts.

San Diego took a 2-0 lead in the fourth when Venable and Baker hit two-out run-scoring singles after Cahill had issued one-out walks to Carlos Quentin and Yonder Alonso.

Montero made it 2-1 in the bottom of the inning when he doubled home Justin Upton, who led off the inning with the first of his two doubles.

John McDonald reached on an infield single to start the fifth, went to second on a sacrifice and scored on Eaton’s triple to left-center field — his first career RBI in 44 at-bats and his first career triple.

Eaton scored when Volquez was called for a balk for starting his motion and then stepping off the rubber. Upton doubled and Goldschmidt followed with a double for a 4-2 lead.

Arizona made it 6-2 in the eighth when Brad Boxberger hit Montero with a pitch, Dan Wheeler tripled and second baseman Logan Forsythe’s relay throw sailed into the Diamondbacks dugout to allow Wheller to score.