Cleveland Cavaliers All-Star guard Kyrie Irving will undergo an MRI exam Friday after suffering a worrisome left knee injury in a 108-100 overtime loss to the Golden State Warriors. How quickly he can heal might well determine what chance the Cavaliers have of bouncing back to defeat the Warriors in the best-of-seven NBA Finals starting with game two on Sunday. Irving scored 23 points and contributed seven rebounds, six assists, four steals and two blocked shots for the Cavaliers in more than 43 minutes on the court before falling to the court in pain with 2:23 remaining in overtime as he tried to dribble past Golden State defender Klay Thompson.