On August 1, 2014, Parker signed a three-year, $43.3 million contract extension with the Spurs. The Spurs finished the 2014-15 season with a 55-27 record, but lost in the first round of the playoffs to the Los Angeles Clippers in seven games. Parker struggled in the playoffs due to injury and averaged 10.9 points a game on 36% shooting. In the 2015-16 season, Parker helped the Spurs win a franchise-best 67 games while averaging 11.9 points per game. In the 2016 playoffs, the Spurs swept the Memphis Grizzlies in the first round, but were eliminated in the second round by the Oklahoma City Thunder in six games. Heading into the 2016-17 season, Parker lost longtime teammate Tim Duncan to retirement. The Spurs finished the season with a 61-21 record, as they registered back-to-back 60-win seasons for the first time in franchise history. Parker played 63 games and averaged 10.1 points per game, his lowest average since his rookie season. In the 2017 playoffs, the Spurs were once again matched with the Memphis Grizzlies in the first round. San Antonio again defeated Memphis 4-2, with Parker averaging 16.3 points per game in the series. After scoring 18 points in Game 2 of the second round, a win against the Houston Rockets, Parker left the game with a rupture of his left quadriceps tendon that ended his season. Game 3 of the series marked San Antonio's first postseason game without Parker since 2001, which ended an NBA record of 221 straight playoff appearances for Parker. The injury required surgery and led some to speculate Parker could miss significant time, if he came back at all. On November 27, 2017, in a 115-108 win over the Dallas Mavericks, Parker had six points and four assists in 14 minutes in his first appearance since tearing his quadriceps tendon. On November 29, Parker had 10 points and five assists while playing 18 minutes in his second game back.

Answer this question "What team did he play against in the fifth championship?" by extracting the answer from the text above.
Dallas Mavericks,