After four years of seemingly never-ending knee and weight issues, Sean May faces an uncertain summer as an unrestricted free agent after the Charlotte Bobcats decided not to make a qualifying offer to their former first-round pick. Plagued first by chronic knee pain that led to microfracture surgery, May struggled to get into proper playing shape last season for coach Larry Brown, who refused to play the 6-foot-9 power forward for long stretches until he lost weight.