Adam Eaton lasted one at-bat and aggravated an injury. Conor Gillaspie dropped an easy pop fly. Jose Quintana made one bad pitch and ended up with his first loss since the middle of June.

The Chicago White Sox are in quite a slump.

"Everything we're going through, it's just like you're in a funk," manager Robin Ventura said. "If it can go wrong, it's going to go wrong."

Mike Zunino hit a three-run homer, Hisashi Iwakuma pitched seven innings and the Seattle Mariners beat the White Sox 4-1 on Friday night, handing Chicago its fourth straight loss and sixth in seven games.

The White Sox have been outscored 55-13 over the past five games and allowed 71 total runs in eight games in August.

"A combination of we're not playing that well, we're playing a team that's playing well and everything seems to be going right for them," Ventura said.

Zunino moved into a tie for the major league lead in home runs by a catcher with his 18th of the season. Zunino's opposite-field drive to right off Quintana in the fifth gave Seattle a 3-1 lead and came after Gillaspie dropped a popup from Logan Morrison. Kendrys Morales added a sacrifice fly later in the inning.

Iwakuma (10-6) overcame problems with command to become the third Seattle pitcher with double-digit victories this season. The Japanese right-hander allowed one run and five hits, struck out three and walked none.