Swiss tennis ace Roger Federer has lost his world number one ranking but is gunning for Gold in the 2008 Beijing Summer Olympics Mens Tennis championship.

As one of Switzerland's main medal hopes, he will be carrying his nation's flag during the opening ceremony on Friday.

Roger Federer talks about the task ahead in a pre-Games press conference.

Federer is looking to get back on track at the Beijing Summer Olympics and the upcoming US Tennis Open after early round exits in Cincinnati and Toronto and back-to-back Grand Slam defeats to Rafael Nadal at both Wimbledon and the French Open.

"I still have plenty of tournaments to do well in, and I hope I can start here at the Olympics, going on to the US Open"