Wayne Rooney window opened on 10 July. On 14 July, in a 3–1 win against the Vancouver Whitecaps, Rooney made his debut for United, coming on for Darren Mattocks in the 59th minute, and assisted a goal by Paul Arriola. Rooney's debut came on the unveiling of DC United's new $400 million stadium, Audi Field. After three games, Rooney was named captain by manager Ben Olsen. His first goal for the club came on 28 July in his first game with the armband, slotting past his former Manchester United teammate, goalkeeper Tim Howard, securing a 2–1 win over the Colorado Rapids at
Wayne Rooney game of the 2009–10 season against Birmingham City, taking his overall United tally to 99. On 22 August, he became the 20th Manchester United player to score 100 goals for the club, when he found the net twice in a 5–0 away win at Wigan. On 29 August, United played Arsenal at Old Trafford. Rooney scored a goal from the penalty spot to level the game after Andrey Arshavin had put the Gunners ahead. The game finished 2–1 to Manchester United after Abou Diaby scored an own goal. On 28 November 2009, Rooney scored his first hat-trick for three years