Rockies manager Walt Weiss was unclear if Masset hurt his knee planting on that pitch or running to cover home. Regardless, he was escorted off by a trainer and was sent for an MRI following the Rockies' 8-7 victory.
Masset had been one of the better pitchers in a beleaguered bullpen this season, having surrendered nine earned runs over 23 2/3 innings with 18 strikeouts. He departed Saturday's appearance without recording an out, however, and Boone Logan permitted the inherited runner to score, bumping Masset's season ERA up to 4.94 from 3.42.
Cody Ulm is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.