Spanish football club Real Madrid has topped an annual Forbes list of the world's most valuable sports teams. The club, who won the Champions League in May, is worth an estimated 3.44 billion dollars, Forbes said. The top three slots are occupied by football clubs, with Barcelona in second place at 3.2 billion dollars and Manchester United third, with a value of 2.81 billion dollars. Forbes calculated the value of the teams based on equity, debt and stadium deals.