Jon Niese leaves start with knee pain

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Mets starter Jon Niese left his start Tuesday night against the Cardinals due to left knee pain.

Niese walked two and gave up an RBI single before leaving with a trainer with one out in the bottom of the first inning. He was eventually charged with three earned runs. Robert Gsellman, just up from Las Vegas, took over, making his major league debut under unexpected circumstances.

Niese, who has not pitched well at all since coming over in a trade with the Pirates, is likely to be placed on the disabled list after the game or before tomorrow’s game.