Question: The 1979–80 Phoenix Suns season was the 12th season for the Phoenix Suns of the National Basketball Association, the Suns were led by head coach John MacLeod, an American, his which number season with the team?
Sentence (from "1979–80 Phoenix Suns season"): The Suns defeated Western Conference foe Kansas City in the opening round of the playoffs, marking the first time the Suns had won a playoff series in back-to-back seasons.
Relevant evidence: No