Roger Federer Indian Wells

After three rounds, the biggest names in tennis are still standing as the fourth round of the 2013 BNP Paribas Opens begins Wednesday in Indian Wells, Calif.

Rafael Nadal continued his return to the hard court, but it was made easier Monday when his opponent, Argentina’s Leonardo Mayer, withdrew at the last minute from their third-round match with a back injury

Nadal, who hadn’t participated in hard court tournament in a year, faces Latvia’s Ernests Gulbis in the fourth round. The 24-year-old defeated ninth ranked Janko Tipsarevic in the second, and 20th ranked Andreas Seppi in three sets in the third round.

A battle for Swiss dominace takes place with Stanislas Wawrinka challenging defending champion Roger Federer. At 31 years old, the No. 2 player in the world is gunning for his 77th career singles title, after thumping Ivan Dodig 6-3, 6-1 in the third round.

Wawrinka is 1-14 all-time against Federer, with his only victory coming in 2009 at Monte Carlo.

In matches taking place later in the day, Novak Djokovic meets American Sam Querrey. Undefeated in 2013 with a 13-0 record, Djokovic did fall to Querrey last year in Paris 0-6, 7-6(5), 6-4.

Coverage of the matches will begin at 2 p.m. eastern time on ESPN3, which can be watched on a live online stream here.