Milos Raonic emerged as the only Canadian survivor from five starters on opening day at the U.S. Open Monday.
The fifth seed reached the second round over Japan's Taro Daniel 6-3, 6-2, 7-6 (1).
Raonic had a smooth ride in the first two sets, but hit speed bumps as he tried to serve it out.
The Canadian saved two break points with aces in the 10th game leading 5-4 but hit the net with a backhand to make it 5-5 in the third set. The set went to a tiebreaker where Raonic finally got the job done.
The player from Thornhill, Ont., took just over 90 minutes to earn victory with 20 aces and nearly 60 winners.
Montreal's Eugenie Bouchard starts her tournament on Tuesday playing Olga Govortsova of Belarus.