Top-seeded Bob and Mike Bryan of the United States advanced to the quarterfinals of Olympic doubles Tuesday by edging Nikolay Davydenko and Mikhail Youzhny of Russia, 7-6 (6), 7-6 (1).
Andy Roddick quickly took to Olympic grass Monday, winning his first-round match at Wimbledon over Martin Klizan of Slovakia, 7-5, 6-4.
Philipp Kohlschreiber and Nikolay Davydenko pulled out of the Madrid Open on Thursday with injuries.
It's essentially a Masters Series event without byes. None of the top-tier men appear to have a seamless path toward an Olympic medal.