Knowles ousted in doubles; USTA juniors update

   Mark Knowles of the Sacramento Capitals and Philipp Petzschner of Germany lost to Serbians Novak Djokovic and Janko Tipsarevic 5-7, 6-3 (12-10 match tiebreaker) Monday in the first round of doubles at the $2.43 million Rogers Cup in Montreal.
   Petschner won last year's Wimbledon men's doubles title with Jurgen Melzer of Austria.
   Knowles, a Bahamian who turns 40 on Sept. 4, won his first men's doubles title of the year and the 54th of his career two weeks ago. In his initial tournament with Xavier Malisse of Belgium, Knowles won in Los Angeles for the first time. The tournament was held at UCLA, where Knowles played from 1990 to 1992.
   Knowles ranks fourth among active players in career men's doubles titles -- behind Mike Bryan (75), Bob Bryan (73) and Daniel Nestor (73) -- and is tied for 16th in the Open Era (since 1968). Knowles played for most of his career with Nestor, winning all three of his Grand Slam men's doubles titles with the Canadian. 
   USTA junior nationals --Seventeenth-seeded Anthony Tsodikov of San Francisco reached the fourth round of 18 singles in the USTA Boys National Championships in Kalamazoo, Mich. Tsodikov will face No. 1 seed Jack Sock of Lincoln, Neb. Sock, the defending champion, recently turned pro.
   Matthew Alves of Gold River lost to 20th-seeded Michael Redlicki of Hawthorn Woods, Ill., 6-4, 6-4 in the third round.
   Top-seeded Connor Farren of Hillsborough advanced the fourth round of the 16s, but Brandon Sutter of El Dorado Hills fell to Konrad Zieba of Glenview, Ill., 6-1, 2-6, 6-2.
   In San Diego, 10th-seeded Ellen Tsay of Pleasanton gained the third round of girls 18 singles, and unseeded Mary K. Closs of Menlo Park moved into the round of 32 in the 16s.
   In San Antonio, second-seeded Cameron Klinger of San Jose and 13th-seeded Victor Pham of Saratoga reached the round of 16 in boys 14 singles, but 17th-seeded Kenneth Tao of San Jose fell in the round of 32.
   In North Little Rock, Ark., eighth-seeded Sam Riffice of Roseville advanced to the round of 16 in boys 12 singles.
   In Alpharetta, Ga., top-seeded Catherine Bellis of Atherton, fifth-seeded Michaela Gordon of Los Altos Hills and 16th-seeded Katya Tabachnik of San Francisco reached the round of 16 in girls 12 singles. Gordon beat 17th-seeded Alexa Corcoleotes of Hillsborough 6-2, 6-1 in the round of 32.