Twelve-time French Open champ Rafael Nadal has dropped just 19 games through his opening three matches at this year's tournament.
Stan Wawrinka stunned Bulgarian sixth seed Grigor Dimitrov 1-6, 7-6 (7/3), 7-6 (7/5), 6-4 on Centre Court.
Andy Murray won 6-1, 6-3 in the south coast English town of Eastbourne in Monday during a warm-up event for Wimbledon.
Murray was playing only his second match after 11 months on the sidelines with a hip injury that required surgery in January.
With 10,370 points, Murray continued to lead the rankings of the last week, a position he has managed to maintain since November 7.
Andy Murray and Novak Djokovic will be big favourites for the Australian Open when it begins in Melbourne on Monday.