Line judges are being tested by a television instant replay for the first time at the Australian Open, and the results so far support the old adage that no one’s infallible. Halfway through the fourth round, men’s singles players challenged line calls 79 times and women 44 times, for 123 overall.On the men’s side, 39 calls were upheld and 40 overturned, for a percentage of 50.63. Judges fared better among the women, with 25 of the challenged decisions being upheld and 19 overturned, or 43.18 per cent. Marat Safin, the 2005 champion, had the most challenges — 11 in three matches, with seven calls overturned. Some players don’t like the system, including Roger Federer who says it gives the chair umpires an excuse to be lax. Time to shop• China’s Li Na reached her second Grand Slam quarter final and gave Martina Hingis a run for her money today on the way to her best performace at the Australan Open. Now for some shopping.Li troubled Hingis with powerful groundstrokes to win the first set before the former world No 1 lifted and took the match 4-6, 6-3, 6-0.“I played pretty well in the first set, I got opportunities in the second set. After that, she got the rhythm of the game,” Li said.She said she was not too disappointed with her performance. “Very satisfied. Time to do shopping now,” she said.Hard to Please• Anna Chakvetadze is into the Australian Open quarter finals and has won 20 of her last 21 matches, but she's not getting confident about her chances against either Maria Sharapova or Vera Zvonareva.“I think I had a pretty good draw, especially the first two rounds,” Chakvetadze said today after her 6-4, 6-1 win over Patty Schnyder. No. 12 Chakvetadze has won three of her four matches in straight sets here and was correct in saying she got lucky with the draw, not having to face a top player until beating the eighth-seeded Schnyder.
