Tzipi Obziler was knocked out in the first round of the US Open on Monday night, losing 4-6, 6-2, 7-5 to Caroline Wozniacki of Denmark. The 34-year-old Israeli got off to an encouraging start and easily claimed the first set. Wozniacki, however, lifted her play in the next two sets and booked her place in the second round of the tournament. Obziler, who is ranked No. 97 in the world, came back from a 5-2 deficit in the third set to tie the score, but was broken in the crucial 12th game, gifting Wozniacki (86) the match. Obziler was making just her second career appearance at Flushing Meadows and was looking to advance to the second round of a Grand Slam tournament for only the fifth time in her many years on the tour. Shahar Pe'er, who is suffering from a chest injury, is now Israel's only remaining female representative at 2007's final Grand Slam. The 20-year-old faces American Meilen Tu in the first round.