TENNIS:Serena Williams, who will regain the top ranking if she reaches the semifinals of the Qatar Open, showed no signs of the back or ankle injuries that troubled her at the Australian Open during her 6-2, 6-1 win over Daria Gavrilova in Doha.
After a 10-year winning streak, wheelchair tennis great Esther Vergeer, 31, announced her retirement, ending one of the most amazing careers in any sport. Vergeer won the women's singles gold at four straight Paralympics starting in Sydney in 2000 and ending in London last year. She also won 21 Grand Slam singles titles, 23 Grand Slam doubles titles, three Paralympic doubles gold medals and a silver. Overall, she won 148 singles titles and 136 in doubles. The last time she lost a match was on Jan. 30, 2003.
Her retirement means she will not surpass what is believed to be the longest run of consecutive wins in any sport - 555 by squash legend Jahangir Khan from 1981 to 1986.
SOCCER: Juventus got goals from Alessandro Matri, Claudio Marchisio and Mirko Vucinic to take a 3-0 Champions League victory over host Celtic in Glasgow. . . . In Spain, goals by Ezequiel Lavezzi and Javier Pastore gave Paris Saint-Germain a 2-1 road win over Valencia.
American midfielder Mix Diskerud agreed to a two-year contract with Norway's Rosenborg. The 22-year-old scored two goals in 18 appearances for the Tondheim club.
GOLF: Pebble Beach winner Brandt Snedeker has withdrawn from next week's Match Play Championship in Marana, Ariz., because of sore ribs. He will be replaced by Fredrik Jacobson, who is No. 66 in the ranking. The top 64 in the world are eligible for the event. Tenth-ranked Phil Mickelson has said he won't be playing.
OLYMPICS: The IOC stripped Russian weightlifter Oleg Perepechenov of his bronze medal from the 2004 Athens Games after his stored samples tested positive for clenbuterol.
- Staff and wire reports