The regular season finale against the Minnesota Timberwolves was meaningless to San Antonio. Still, Spurs coach Gregg Popovich called two timeouts within 30 seconds early in the first quarter to stress assignments. "Just like any coach, you want to improve everything that you're doing," Popovich said. "There isn't a lot of time between now and Sunday, so we want to be healthier and we'll continue to work on executing at both ends of the court. It's a game of mistakes. Nobody is perfect in what they do. You just go to work and keep preparing." The Spurs, who previously clinched the Western Conference's second seed, have a lot of work to do after losing their third straight and fourth in five games to close the season. Derrick Williams had 21 points to help the Timberwolves beat the Spurs 108-95 Wednesday night, ending a 16-game losing streak at San Antonio.