08/21/2014 12:25 pm ET Updated Aug 21, 2014

Angels Lose Star Pitcher Garrett Richards For Rest Of The Season (VIDEO) [UPDATED]

The Los Angeles Angels' seventh win in their last eight games was overshadowed by the scary knee injury suffered by star pitcher Garrett Richards.

There were base runners on first and third base in the fifth inning when Boston's Brock Holt hit a ground ball right to Albert Pujols. With just one out, the 26-year-old ran over to cover first base for a potential double-play as Pujols fired the ball to second. But as Richards made his way to the base, he slipped on the dirt and his left knee buckled. The righty began writhing in pain as trainers quickly attended to him on the field. He was on the ground for several minutes until he was carted off on a stretcher.

"To have something like that happen is a crushing blow to any team," Angels pitcher Jered Weaver said after his team's 8-3 win, via the Los Angeles Times. "I heard him screaming down there, so you knew something wasn't right. It doesn't look too good for him. He's been our guy all year, one you could count on to get deep into games and pull out a victory."

Richards had become one of the most dominant pitchers in the majors this season, posting a 2.61 ERA and 1.04 WHIP with a 13-4 record. The Angels, who recently jumped the Oakland A's for the top spot in the AL West, had won 11 of Richards' last 14 starts before Wednesday.

When asked if Richards would be out for the rest of the season, Angels manager Mike Scioscia said he wouldn't "assume anything, but it's a significant injury," per

Richards was scheduled to fly back to Los Angeles on Thursday morning to be re-evaluated.

UPDATE: Richards will miss the rest of the season.