The Shanghai Masters, which one of two remaining Masters 1000 events of this season, is of great importance as the top players are attempting to garner enough points to make the field of the Barclays ATP World Tour Finals in London.
Top-seeded Rafael Nadal, who already clinched a spot in London, cruised to victory in his first match of the tournament against the 21st ranked Stanislas Wawrinka. The routine 6-4, 6-4 victory improved Nadal's record against Wawrinka to 7-0 all-time. Wawrinka played well at times, but he never troubled Nadal, who committed only 12 unforced errors and won 79 percent of his first-serve points.
Nadal's next opponent will be the 13th seeded Jurgen Melzer, who most recently lost to the Spaniard at this year's French Open.
Third-seeded Roger Federer was also impressive in his second round match. Federer, who has already assured himself of a spot at the World Tour Finals, defeated the 20th ranked John Isner 6-3, 6-4 in just over one hour. Federer, who hasn't played since the US Open, looked crisp on his serve against Isner, as he was never broken and he won 84 percent of his first-serve points.
In the third round, Federer will face the Italian Andreas Seppi, who has never defeated the former world number one in six attempts.
Other second round winners included second-seeded Novak Djokovic, fourth-seeded Andy Murray, and fifth-seeded Robin Soderling.