For a while, Tim Duncan played along, pretending to be amused as the questions kept coming late Saturday night, each one a derivative of how he keeps doing this at age 37. The San Antonio Spurs had just completed what many of their veterans were calling one of the greatest victories over all their years and championships together, defeating the Memphis Grizzlies 104-93 in overtime at FedExForum. Somehow, they had survived everything the Grizzlies could throw at them: an early 18-point deficit, a rowdy arena at full-tilt, a team desperate to try to make this a series. And yet, as Duncan sat on a rubber balance ball in the visitors' locker room in the wake of a Spurs masterpiece that put them on the brink of another NBA Finals, he could only tolerate for so long a conversation about something as trivial as his age in the midst of all this. "Am I surprised at what I'm able to do (at 37)?" Duncan said. "I'm just here to play, man. I'm not worried about how old I am or whatever it may be; I'm very focused on having another opportunity to make it to the championship and try to win one." Duncan may not want to acknowledge that he's not supposed to be doing this, but it is no less a marvel for the rest of us how he has owned these Western Conference finals. Tony Parker has undoubtedly been the best player in the series, controlling almost everything for the Spurs, but Duncan has been their finisher. After dominating overtime in Game 2, he was magnificent once again when it mattered most, scoring the Spurs' first five points in overtime to cap off a 24-point, 10-rebound performance.