Tokyo:
Del Potro broke Berlocq's serve twice in the second set and closed out the match in 1 hour, 6 minutes.
Del Potro was a late addition to the tournament after Andy Murray, the 2011 champion, withdrew due to a back injury. Del Potro is seeking his third title of the season following victories in Rotterdam and Washington.
In the day's only upset, Ivan Dodig of Croatia ousted second-seeded Jo-Wilfried Tsonga of France 6-4, 7-6 (5).
In other matches, third-seeded Milos Raonic of Canada advanced to the second round with a 6-4, 7-6 (0) win over Go Soeda of Japan in the opening match on Center Court.
Topics mentioned in this article
Tennis
Somdev Devvarman
Juan Martin del Potro
Serena Williams
Alisa Kleybanova
Anastasia Pavlyuchenkova
US Open 2011
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