For the second match in a row, five-time champion Roger Federer overcame a sluggish start to move along at the US Open.
With rain causing havoc to the schedule, only Arthur Ashe Stadium and Louis Armstrong Stadium were in use during the morning session in New York.
And Federer initially struggled to get going under the closed roof at Arthur Ashe against Damir Dzumhur.
The third seed needed four sets to beat world No 190 Sumit Nagal in the opening round at Flushing Meadows and on Wednesday he again was slow out of the blocks against world No 99 Dzumhur.
Once he settled down, Federer eased to a 3-6, 6-2, 6-3, 6-4 victory in two hours and 21 minutes.
First set goes to Dzumhur!
— US Open Tennis (@usopen) August 28, 2019
Dzumhur raced into a 4-0 lead in the opening set as he broke twice, but Federer broke back in game five to get on the scoreboard before the Bosnian eased to a one-set lead by holding his next two service games.
The 20-time Grand Slam winner then broke twice in the second set, once in the third and once in the fourth to get the job done.
Federer will face either 25th seeded Frenchman Lucas Pouille or British No 2 Dan Evans in the third round.
Seventh seed Kei Nishikori was the only other player in the men’s draw to get a win under his belt in the morning session as he saw off American Bradley Klahn 6-2, 4-6, 6-3, 7-5.
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