Kyrie Irving's toughness is not in question, but when he will play again for the Mavericks is. In the first quarter Monday night, Irving drove the lane against Sacramento, was fouled by DeMar DeRozan,

KKyrie Irving suffered a left knee sprain and shot free throws for the Mavericks before leaving the floor in obvious pain late in the first quarter of Dallas’ 122-98 loss to the Sacramento Kings

Irving was fouled by DeMar DeRozan on a drive to the basket and his right foot landed on the foot of the Kings' Jonas Valanciunas. He lost his balance and then landed awkwardly on his left leg,