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HOUSTON - Brad Peacock was rolling, the Houston Astros had the lead and then the pitcher plunked Robinson Cano.

Things quickly fell apart after that as the Mariners jumped on Peacock for four runs in the sixth inning in a 5-2 win Wednesday.

He just lost command, manager Bo Porter said. Lost command of the strike zone. He was in a complete groove and what we felt like complete control of the game then had the hit batter where he held on to a cut fastball too long and then was not able to get back in the zone.

Logan Morrison drove in two runs in Seattle s big inning and Chris Young pitched seven strong innings to help the Mariners complete a three-game sweep.

The Mariners trailed by two and couldn t get anything going against Peacock until the sixth. James Jones got things started with a one-out single, before Peacock hit Cano with a pitch and walked Kyle Seager on four pitches to load the bases.

Jones cut the lead to one when he scored on a wild pitch, and Morrison s two-run double gave Seattle a 3-2 lead. John Buck s run-scoring single pushed the lead to 4-2 and chased Peacock.

I just kind of lost it, Peacock said. I ll go back and look at some video and see what I was doing wrong. I felt great up into that point. It kind of stinks.

Peacock allowed six hits and four runs in 5 1-3 innings.

Young (8-4) allowed two hits - both solo homers - and struck out a season-high eight. It was his most strikeouts since he fanned nine against Colorado in 2012. Fernando Rodney pitched a scoreless ninth for his 24th save.

Marwin Gonzalez and rookie Kike Hernandez homered for the Astros. Hernandez has three hits and two RBIs in two games since being called up from the minors.

He s swinging a good bat and that s why he was in the lineup (Wednesday) and he ll be in the lineup (Thursday), Porter said of Hernandez.

He played designated hitter on Wednesday in place of the slumping Chris Carter, who is in an 0-for-15 skid and is hitting just .181.

Dustin Ackley had three hits for the second straight game after snapping an 0-for-21 skid Tuesday night, and Jones had a hit to finish the series with eight hits, six runs and two RBIs.

Seattle has scored 11 runs in the sixth inning in the last two games after managing just 31 runs in that inning in the first 83 games this season.

Peacock was replaced by Anthony Bass, who was making his first appearance since May 10 after being reinstated from the disabled list on Wednesday. Bass allowed a single by Ackley with two outs before retiring Brad Miller to end the inning.

Cano hit a two-out double in the seventh and scored on a single by Seager to push the lead to 5-2.

Young didn t allow a hit until Gonzalez s homer to right field with one out in the third inning. It was the second home run of the series for Gonzalez, who recently became Houston s everyday shortstop when opening day starter Jonathan Villar was optioned to Triple-A.

Young got back on track after that, retiring the next seven batters. Houston s didn t get another hit until the home run by Hernandez with two outs in the fifth made it 2-0.

Young has given up 14 home runs this season, which leads the team, but 11 of those homers have been solo shots.

Peacock allowed a single to Ackley with two outs in the second inning before retiring the next six batters. Buck singled with two outs in the fourth, but Peacock still faced the minimum in that inning when the catcher was out trying to stretch it into a double.

Altuve grabbed the less-than-perfect throw from rookie left fielder Domingo Santana and crawled to the bag for the out.

Peacock threw a perfect fifth inning and struck out Endy Chavez to start the sixth before the trouble began.

NOTES: The Mariners are off Thursday before opening a series with the White Sox on Friday. ... The Astros begin a four-game series against the Angels on Thursday. ... Houston optioned LHP Kevin Chapman to Triple-A Oklahoma City to make room for Bass on the roster. ... The Astros agreed to terms with international free agents RHP Franklin Perez, SS Miguelangel Sierra and C Brandon Benavente on Wednesday.

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