Rookie Jackson Merrill singled home two runs during a six-run fifth inning as the visiting San Diego Padres opened a three-game series against the Milwaukee Brewers with a 7-3 win on Monday.

San Diego starter Joe Musgrove (2-2) allowed three runs on seven hits over six innings. He walked four and struck out three.

The Brewers loaded the bases with two outs in the ninth before Robert Suarez retired Sal Frelick on a fly ball to left field for his sixth save.

Merrill, who had three hits and a stolen base, is 9-for-17 over his past four games for San Diego, which has won four of its past five. Manny Machado and Luis Campusano each contributed two hits and an RBI to Monday's victory.

Jackson Chourio went 2-for-4 with a two-run homer and a stolen base for Milwaukee, which was held to three singles and three walks in the final six innings. William Contreras extended his hitting streak to 11 games with two singles.

The Padres trailed 3-1 before chasing Milwaukee starter Joe Ross (1-1) with six runs on six singles, a walk, a catcher's interference and a passed ball in the fifth inning.

Ross allowed three consecutive singles to begin the inning before Campusano scored on Fernando Tatis Jr.'s groundout. The Padres tied the game at 3-3 when Tyler Wade scored on a passed ball, then moved ahead on Machado's RBI single after Jake Cronenworth reached base on catcher's interference.

Merrill delivered his two-run single to put the Padres ahead 6-3, and Campusano followed with an RBI single to left field, ending Ross' outing.

Ross gave up seven runs (six earned) over 4 2/3 innings. He walked two and struck out four.

Milwaukee claimed an early lead in the first inning when Willy Adames' one-out single scored Chourio from second base.

Chourio put the Brewers ahead 3-0 with a two-out, two-run home run to left field in the second. The 368-foot blast was Chourio's third long ball of the season.

San Diego pushed a run across in the fourth inning when Cronenworth scored on Ha-Seong Kim's fielder's-choice grounder.

Milwaukee played without left fielder Christian Yelich, who missed his third straight game with discomfort in his lower back.

--Field Level Media