Ike Davis suffered a strained right oblique muscle on a third-inning sacrifice fly on Saturday night.
The injury will likely end his season and potentially his career with the New York Mets.
Davis will head to New York and undergo an MRI after the Labor Day weekend.
"It's horrible," Davis said. "I just started playing a little better and started to feel confident again and stuff like that. It sucks, because I don't know if I can get back to play in any games this year. But at least I was starting to play better. Stuff like this happens."
Davis, again eligible for arbitration this offseason, is making $3.125 million in 2013.
Via Adam Rubin/ESPN