 In 2005 , Federer failed to reach the finals of the first two Grand Slam tournaments , losing the Australian Open semifinal to eventual champion Safin after holding match points , and the French Open semifinal to eventual champion Rafael Nadal . However , Federer quickly reestablished his dominance on grass , winning the Wimbledon Championships over Andy Roddick . At the US Open , Federer defeated Andre Agassi in the latter 's last major final . 
