Novak Djokovic overcame some strong play by Kwon Soon-woo to take the fourth set and the match.
World number two Rafael Nadal advanced to the US Open third round by walkover after Australian Thanasi Kokkinakis withdrew from the tournament with a right shoulder injury.
Twenty-times grand slam champion Roger Federer suffers a shock 3-6 6-3 7-6(4) defeat by Australian Thanasi Kokkinakis in the Miami Open second round on Saturday.
The US-listed firm wants to stop the 21-year-old from using its trademarked product name as a moniker in advertisements for tennis clothing.
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