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,

Mavericks star Kyrie Irving suffered a knee sprain vs. the Kings, but remained in the game long enough to hit two free throws before being ruled out.

Kyrie Irving suffered a left knee sprain Monday night and shot free throws for the Mavericks — with tears rolling down his cheeks — before leaving the floor in obvious pain late in the first quarter of Dallas' 122-98 loss to the Sacramento Kings.