ANAHEIM, Calif. -- Los Angeles Angels closer Huston Street is sidelined indefinitely with an apparent groin injury he suffered in the ninth inning Saturday, Mike Scioscia said.

"It's not good," the manager said.

Street faced two Mariners in the ninth before doubling over in pain when he threw a pitch that led to Franklin Gutierrez's groundout. Street then had to be helped off the field in obvious pain, and after the Angels sealed a 3-2 walk-off win on David Freese's home run, Scioscia said it was unlikely the AL saves leader would return for the remaining nine games of the regular season.

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The Angels remained a half-game behind Houston in the AL wild-card race and moved within four of Texas for the AL West lead.

Los Angeles already is without Joe Smith, its second-best reliever and eighth-inning specialist, after he sprained his ankle on a hotel staircase.

Mike Trout earned the save Friday night in the fourth inning, when he tracked Jesus Montero's drive into deepest center field and made a jaw-dropping catch to rob him of a home run, which saved three runs and helped to keep the Angels in the thick of the playoff race.

''I've never seen a better one,'' Scioscia said.

The Associated Press contributed to this report.