Duncan and his Spurs looked to re-assert themselves in the next 2004–05 season. Despite their new captain's slight statistical slump (20.3 points, 11.1 rebounds, 2.7 assists, 2.6 blocks per game), the Spurs won the second seed for the 2005 NBA playoffs by winning 59 games. In the first round, the Spurs eliminated the Denver Nuggets four games to one, and met the Seattle SuperSonics in the semi-finals. After splitting the first four games, Duncan led his team to two decisive victories, setting up a meeting with the Phoenix Suns, known for their up-tempo basketball. The Spurs managed to beat the Suns at their own game, defeating them 4–1 and earning a spot in the 2005 NBA Finals against the Detroit Pistons. In the Finals, Duncan was pitted against Detroit's defensively strong frontcourt anchored by multiple NBA Defensive Player of the Year Ben Wallace. After two convincing Game 1 and 2 wins for the Spurs, the Pistons double teamed Duncan and forced him to play further from the basket. Detroit won the next two games and the series was eventually tied at 3–3, but Duncan was instrumental in Game 7, recording 25 points and 11 rebounds as the Spurs defeated the Pistons. NBA.com reported that "with his unique multidimensional talent, Duncan depleted and dissected the Pistons... He was the fulcrum of virtually every key play down the stretch", and coach Popovich added: "[Duncan's] complete game is so sound, so fundamental, so unnoticed at times, because if he didn't score, people think, 'Well, he didn't do anything'. But he was incredible and he was the force that got it done for us." Pistons center Ben Wallace remarked: "He put his team on his shoulders and carried them to a championship. That's what the great players do." Duncan won his third NBA Finals MVP Award, joining Michael Jordan, Shaquille O'Neal, and Magic Johnson as the only players in NBA history to win it three times.
