Top seed Novak Djokovic reached the third round of the US Open when Jiri Vesely of the Czech Republic was forced to withdrawal due to a left forearm injury on Wednesday.
The withdrawal of the 23-year-old Vesely could be a blessing in disguise for defending champion Djokovic as it gives him time to rest his niggling left wrist injury.
— US Open Tennis (@usopen) August 31, 2016
The Serb will next be up against either Argentina's Guido Pella or Mikhail Youzhny of Russia.
In other second round results, South African 23rd seed Kevin Anderson beat Vasek Pospisil of Canada 7-6(3), 6-4, 6-4 in a match lasting two hours and 42 minutes.
In the opening set both dropped serve once in the first two games and things proceeded to a tie-break which the big-serving South African won 7-3 to clinch the set.
In the second, Pospisil was broken in the fifth game for Anderson to claim the set 6-4.
Pospisil dropped his serve twice in the third for Anderson to claim the set and match 6-4 to set up a meeting against either ninth-seeded Frenchman Jo-Wilfried Tsonga or James Duckworth of Australia in the third round.
Kyle Edmund of Britain defeated American Ernesto Escobedo in straight sets, winning 7-5, 6-4, 6-4.