Niese had X-rays, and the came back negative, reports Ken Burkhardt of Sportsnet New York.
It is being called a contusion, which means that it probably is not too serious. This is good news for the Mets, who have been surprisingly competitive early-on. If they have any hope of continuing their superb play, it revolves around the health of their rotation and especially Jon Niese.
Niese is trying to establish himself as a mid-rotation workhorse, so if he is able to recover quickly from this and come back to play, that will be good for his reputation as a pitcher. He is one of the few players the Mets have that is under contract long-term, and is also very affordable. Him, Matt Harvey, and Zack Wheeler could be very good for a long time.