He told reporters before the game that he had pins inserted in his thumb.
Although he wouldn't say when he'd be back, he did say "I'll be back" this season after he was hit by a pitch in San Diego.
Rob Thomson, the interim manager, told reporters on Wednesday that the surgery to repairHarper's thumb went very well.
The left-handed pitcher from the San Diego Padres threw a pitch that struckHarper in the head. The National League's Most Valuable Player was placed on the 10-day injured list by the Philadelphia organization.
In 64 games this season, the reigning National League Most Valuable Player is batting.318 with 15 home runs, 48 runs, and a.971 OPS despite a small tear in his right elbow that has prevented him from playing the outfield. He tried to avoid Tommy John surgery by getting a blood injection.
The first-place New York Mets are eight games ahead of the second-place Philadelphia Phillies in the National League East.
The AP contributed.