Roger Mason Jr. is starting to build a reputation as one of the better clutch players in the NBA.
I don't think there is another team in the NBA who is better than the Spurs in picking and turning players into good contributors. Tony Parker and Manu Ginobili where nobodies in terms of NBA basketball when the Spurs picked them, 29th and 57th in the draft and look at them now. Matt Bonner and Roger Mason also got big breaks with the Spurs this season, these are no big players when they played for other teams. Rookie George Hill is also a surprise this season. Nobody knew him before he played good basketball for San Antonio. With his age, Michael Finley is supposed to be heading the retirement door if he's playing for other teams but the Spurs still find ways of utilizing him.. and his experience and leadership.
Gregg Popovich is a very great tactician and mentor, there's no surprise seeing San Antonio still dominate despite of their age.