Kirk Nieuwenhuis will undergo an MRI on his bruised left knee Monday morning. Nieuwenhuis injured the knee Sunday while sliding hard into second base during a Grapefruit League game against the Marlins. "Hopefully it's just a bad bruise," the outfielder said Sunday evening. "When I went to go take my lead, it just kind of buckled a little bit, but I think the ligaments are OK." The Mets should provide an update on Monday night.