Andy Murray has refused to look too far into his performance in his US Open first-round match.

Murray beat Alex Bogomolov Jr in straight sets yesterday, but admitted that he could have played better in the match.

However, the number three seed believes that his first-round showing will have no bearing on his performances later in the tournament, citing past experiences as examples.

"Sometimes I've played great at the start of tournaments and not done well, sometimes I've played badly and got better," said the Olympic gold medallist.

"In Australia this year I struggled in my first-round match with my game a bit. Physically I didn't feel great. Then I went on to have a good tournament.

"First-round matches are tricky. The conditions were hard for both of us. That's probably why it was quite an up-and-down match."

Murray will face Ivan Dodig in the second round after the Croatian player beat Hiroki Moriya in straight sets.