The extent of Mercer’s injury was not immediately known after the game. Pirates manager Clint Hurdle did not provide a diagnosis, according to the Pittsburgh Tribune-Review.
While the rest of the Pirates will head to Kansas City, where the team plays Monday, Mercer headed back to Pittsburgh to be evaluated by team doctors.
Mercer stayed down on the ground for several minutes in apparent pain and was eventually carted off the field at Miller Park.
Gomez appeared to be attempting to break up the a potential double play with the slide, which took place during the bottom of the game’s second inning.
The Pirates’ infield was on a shift for Brewers first baseman Adam Lind, a left-handed batter, putting Mercer to the right of second base, normally territory reserved for teammate Jung Ho Kang.
The Pirates television broadcast said Mercer had a lower left leg injury.
The fourth-year player is batting .242 with two home runs and 19 RBI this season.
You can watch video of the slide here, courtesy of MLB.com.