MELBOURNE, Australia - The king of tennis met the British prince.
"Your Royal Highness, welcome to the world of tennis," Federer said. "Thanks for coming."
Prince William duly blushed and waved. The pair shook hands - five wins before Federer usually mixes with royalty on the final Sunday of a major.
"For me it was a very big honor that he came to watch me," Federer said. "He said he was happy that I played a little bit longer because the match could have ended even shorter.
"He shook a lot of hands, and I knew mine was one more. From what I've heard, I think he met Serena and myself, and came to watch my match."
The Williams sisters moved a step closer to a semifinal meeting with straight-set wins in back-to-back matches.
In today's matches, Andy Roddick struggled with Feliciano Lopez before winning 6-7 (4), 6-4, 6-4, 7-6 (3) in 3:32. Justin Henin dropped the first set then beat No. 27 Alisa Kleybanova, 3-6, 6-4, 6-2, to reach the fourth round.
Dinara Safina advanced but Jelena Jankovic continued to run into trouble at the Grand Slams. Second-seeded Safina beat Britain's Elena Baltacha, 6-1, 6-2, and eighth-seeded Jankovic was upset by No. 31 Alona Bondarenko, falling 6-2, 6-3.
Jankovic made 40 unforced errors against 13 winners. She hasn't gone beyond the fourth round at any of the majors since she lost the 2008 U.S. Open final - her only championship match at a major.