INDIAN WELLS (Agencies) - Swede Robin Soderling said he was stupid for playing with an injury on Monday after becoming the highest-seeded casualty at the Indian Wells ATP tournament where Rafael Nadal cruised into the fourth round. Soderling, the fourth seed and hottest player on the ATP Tour this year with three titles to his name, was hampered by his left foot before being eliminated 7-6, 6-4 by German Philipp Kohlschreiber. The premature departure of Soderling followed the early exits by fifth seed Andy Murray of Britain, sixth-seeded Spaniard David Ferrer and defending champion Ivan Ljubicic of Croatia in the second round on Saturday. World number one Nadal, however, had little trouble against American qualifier Ryan Sweeting on the showpiece centre court, moving effortlessly to a 6-3, 6-1 victory. "Always in this tournament I have fantastic feelings," the Spanish left-hander said courtside. "Playing on this hard court, I've had some of the better results in my career." Nadal, champion here in 2007 and 2009, will next meet either Belgium's Xavier Malisse or Indian qualifier Somdev Devvarman. Soderling squandered five set points before losing the opening set tiebreaker 10-8 and he was then broken by Kohlschreiber in the decisive 10th game of the second set. The German, seeded 32nd, has always proven a handful for the Swede, who has now lost four of their five meetings. Although Soderling summoned his trainer after the first set, he did not consider withdrawing from the match at that point. Runner-up at the French Open for the last two years, Soderling planned to have his foot X-rayed before making any decision on whether to play in Miami next week. He initially suffered the injury late on in his 6-3, 6-3, 6-1 victory over Russia's Igor Andreev in a Davis Cup world group first round tie in Boras, Sweden, on March 5. Kohlschreiber, who held one match point before being beaten by Soderling in three tight sets in Rotterdam last month, was delighted to beat the Swede for a fourth time. In other third round matches, former US Open champion Juan Martin del Potro of Argentina beat 20th-seeded Ukrainian Alexandr Dolgopolov 7-6, 6-3 and Spaniard Tommy Robredo crushed American qualifier Donald Young 6-0, 6-4. In womens event, top seed Caroline Wozniacki finally found a way to beat Spaniard Maria Jose Martinez Sanchez with a ruthless 6-1, 6-3 demolition in the third round of the Indian Wells WTA tournament on Monday. India's Somdev Devvarman won the last five points in the third-set tie-break to knock out Belgian Xavier Malisse 6-1, 3-6, 7-6 (5) to set up a pre-quarterfinal encounter with World No. 1 Rafael Nadal at the ATP World Tour Masters 1000 tournament. Somdev, who is playing his third main draw here, was down 2-5 in the tie-break when he reeled off five points to win the hard-fought match on Monday at the BNP Paribas Open in two hours. The 26-year-old India No. 1, ranked 84, who had never won a Masters 1000 match before coming here, beat Frenchman Adrian Mannarino and then upset 19th seed and World No 22 Marcos Baghdatis of Cyprus in the first two rounds. Nadal outplayed Ameican qualifier Ryan Sweeting, 6-3, 6-1 in 68 minutes. This is the second time the Spaniard defeated the 22-year-old American this season, having beaten him at the Australian Open in January. Wozniacki, who had lost to the left-handed doubles specialist in their three previous meetings, broke the Spaniard twice in the second set to seal victory in 72 minutes.