Conversation so far:
Did Roger Federer reach the finals of any tournaments during this period?
Did he have any notable wins during this period?
Was the doubles event doubles or mixed doubles?
Who was his partner for this match?
How old was Federer during this time period?
Did he participate in any of the Grand Slams such as Wimbledon or the Australian Open?

Question: Who did he lose to?
Self-contained rewrite: Who did he lose to?