Kansas City Royals relief pitcher Kelvin Herrera is helped off the field during the seventh inning of Game 1 of baseball's AL Division Series against the Los Angeles Angels in Anaheim, Calif., Thursday, Oct. 2, 2014. (AP Photo/Mark J. Terrill)
Mark J. Terrill
October 03, 2014
Kansas City Royals relief pitcher Kelvin Herrera is helped off the field during the seventh inning of Game 1 of baseball's AL Division Series against the Los Angeles Angels in Anaheim, Calif., Thursday, Oct. 2, 2014. (AP Photo/Mark J. Terrill)
Mark J. Terrill

ANAHEIM, Calif. (AP) Kansas City Royals reliever Kelvin Herrera has a flexor strain in his right forearm, making him unavailable for Game 2 of the AL Division Series against the Los Angeles Angels.

Royals manager Ned Yost says Friday he's optimistic Herrera could pitch in Game 3 at Kansas City on Sunday.

Herrera threw just five pitches in the seventh inning of Game 1 before leaving with tightness in his forearm. Yost says an MRI exam was encouraging, but revealed the strain.

The 24-year-old Dominican reliever with a 100 mph fastball was the seventh-inning specialist in the Royals' dominant bullpen this season. He went 4-3 with a 1.41 ERA in 70 appearances, striking out 59 in 70 innings.

Kansas City won the series opener 3-2 in 11 innings.

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