San Antonio Spurs' Tim Duncan (21), of U.S. Virgin Islands, defends against Memphis Grizzlies' Marc Gasol (33), of Spain, in the first half of an NBA basketball game in Memphis, Tenn., Friday, Nov. 22, 2013. (AP Photo/Danny Johnston)MEMPHIS, Tenn. (AP) — Memphis Grizzlies heart Marc Gasol has a left knee sprain that received't require surgical operation, but the reigning NBA defensive player of the year might be out indefinitely.