The Dallas Morning News (Brad Townsend) reports: Jason Kidd retired Sunday. From USA Basketball competition, not his job with the Dallas Mavericks, with whom he is entering the final season of his $20 million-a-year contract. There is no better way for Kidd to bow out of international basketball, having earned his second gold medal Sunday while extending his record to 56-0 in Olympics, Olympic qualifying and exhibition games.  “I’m undefeated,” Kidd, 35, said. “I told them I can retire now from international ball, but LeBron [James] threw out something I didn’t like. He said he won’t play in 2012 unless I’m there.”