Germany's Philipp Kohlschreiber stunned Australian Open champion Novak Djokovic 6-4, 6-4 on Tuesday, claiming his first career win over a world No. 1 player to reach the fourth round of the ATP Indian Wells Masters. Serbian superstar Djokovic was playing his first tournament since lifting a record seventh title in Melbourne, taking his tally of Grand Slam victories to 15.
He had won eight of nine prior meetings with Kohlschreiber, but could find no answer to the 39th-ranked veteran, who had come up empty in 11 prior attempts to beat a top-ranked rival. World number two Nadal stayed on track to improve that number as he swept past Argentine Diego Schwartzman 6-3, 6-1 to reach the last 16.
Fourth-seeded Roger Federer eased through with a 6-3, 6-4 victory over friend and fellow Swiss Stan Wawrinka. Federer took his record to 22-3 over Wawrinka, a former world number three who is climbing back up the rankings in the wake of double knee surgery.