Daniel Vogelbach hit a two-run homer and the Mariners had 12 hits in an 8-3 win over the Brewers for their first interleague win in five tries this season.
Merrifield had two homers and a career-high six RBIs, Bailey worked into the eighth inning with 121 pitches and the Royals beat the Seattle Mariners 9-0.
Polanco scored on a wild pitch and Marwin Gonzalez hit the go-ahead RBI in the eighth inning , giving the Twins a 6-5 victory over the slumping Seattle Mariners.
Rookie Myles Straw led off the 14th inning with a triple and scored on Yuli Gurriel's sacrifice fly, and the Astros outlasted the Mariners 8-7 Thursday night.
Edwin Encarnacion capped Seattle's sixth inning with a three-run homer, Mike Leake pitched his first complete game since 2015 and the Mariners routed Houston Astros 14-1.
Alex Bregman had two hits and three RBIs, and seven other Astros drove in at least one run as Houston beat the Mariners 11-5 Tuesday night for its fifth straight win.
Jose Suarez allowed three runs over 5 plus innings and got plenty of support from Albert Pujols and the Los Angeles Angels offense to beat Seattle 13-3 on Sunday.
Kole Calhoun and César Puello homered, Mike Trout had three RBIs and the Angels battered Kikuchi for six early runs in a 9-3 victory over the Seattle Mariners.