American wild-card entry Denis Kudla extended his surprising run at Wimbledon, beating Santiago Giraldo of Colombia in five sets Friday to reach the fourth round of a Grand Slam for the first time. Sharapova's tennis skills still looked more than adequate as she advanced to the fourth round by beating Irina-Camelia Begu of Romania in straight sets. Serena Williams erased three breaks in the final set to stave off an upset bid by British home favorite Heather Watson in the third round of Wimbledon. Williams broke right back again, however, held at love and then converted her third match point. The British player broke the top-ranked Williams twice in the second set to level their third-round match 2-6, 6-4 — setting off raucous applause from the partisan crowd. After his third-round victory at Wimbledon on Friday, the top-ranked defending champion stopped as he usually does to sign autographs for supporters before exiting Centre Court. Along with the usual programs and oversized tennis balls that people normally hand over, one man gave the Serb something a bit more unusual — his prosthetic leg. Defending champion Novak Djokovic kept up his winning streak against Australian players by easily beating Bernard Tomic 6-3, 6-3, 6-3 Friday in the third round at Wimbledon. Djokovic broke four times, never faced a break point and made just 12 unforced errors the whole match. The 47th-ranked Vandeweghe, the niece of former NBA player and executive Kiki, beat 2011 U.S.