San Antonio Spurs head coach Gregg Popovich talks to reporters before an NBA basketball game against the Miami Heat, Thursday, Nov. 29, 2012, in Miami. ( AP Photo/Alan Diaz)

San Antonio Spurs head coach Gregg Popovich talks to reporters before an NBA basketball game against the Miami Heat, Thursday, Nov. 29, 2012, in Miami. ( AP Photo/Alan Diaz)

San Antonio Spurs' Tiago Splitter (22) goes to the basket against the Miami Heat in the first half of an NBA basketball game on Thursday, Nov. 29, 2012, in Miami. ( AP Photo/Alan Diaz)

San Antonio Spurs' Patrick Mills (8) drives around Miami Heat's Norris Cole (30) in the first half of an NBA basketball game on Thursday, Nov. 29, 2012, in Miami. ( AP Photo/Alan Diaz)

San Antonio Spurs' Gary Neal (14) is fouled by Miami Heat's Udonis Haslem (40) in the first half of an NBA basketball game on Thursday, Nov. 29, 2012, in Miami. ( AP Photo/Alan Diaz)

San Antonio Spurs head coach Gregg Popovich, right, talks to DeJuan Blair (45) and Gary Neal (14) during a time out in the first half of an NBA basketball game against the Miami Heat, Thursday, Nov. 29, 2012, in Miami. (AP Photo/Alan Diaz)

Miami Heat's Ray Allen (34) shoots over San Antonio Spurs' Gary Neal (14) in the second half of an NBA basketball game in Miami, Thursday, Nov. 29, 2012, in Miami. Miami won 105-100. ( AP Photo/Alan Diaz)

Miami Heat's LeBron James (6) prepares to shoot against the San Antonio Spurs in the second half of an NBA basketball game on Thursday, Nov. 29, 2012, in Miami. Miami won 105-100. ( AP Photo/Alan Diaz)

San Antonio Spurs' Gary Neal (14) shoots as Miami Heat's Rashard Lewis (9) defends and Heat's Chris Bosh (1) looks on in the second half of an NBA basketball game on Thursday, Nov. 29, 2012, in Miami. Miami won 105-100. (AP Photo/Alan Diaz)

Miami Heat's LeBron James (6) prepares to shoot over San Antonio Spurs' Tiago Splitter (22) in the second half of an NBA basketball game on Thursday, Nov. 29, 2012, in Miami. Miami won 105-100. ( AP Photo/Alan Diaz)

San Antonio Spurs head coach Gregg Popovich watches from the sideline in the second half of an NBA basketball game against the Miami Heat, Thursday, Nov. 29, 2012, in Miami. Miami won 105-100. (AP Photo/Alan Diaz)

Miami Heat head coach Erik Spoelstra gestures to his players in the second half of an NBA basketball game against the San Antonio Spurs, Thursday, Nov. 29, 2012, in Miami. Miami won 105-100. (AP Photo/Alan Diaz)

FILE - In this Nov. 29, 2012, file photo, San Antonio Spurs' Tiago Splitter (22) goes to the basket past Miami Heat's Rashard Lewis in the first half of an NBA basketball game in Miami. The Heat won 105-100. Winners of 20 games in a row, the Heat could be headed toward history. The Spurs, who host the Heat on March 31, 2013, are one team looking for their opportunity to stop the streak. ( AP Photo/Alan Diaz, File)