Last Updated: August 28, 2012 6:27am
Andy Murray: will meet Croatian Ivan Dodig in the second round at Flushing Meadows
Andy Murray felt his performance in his 6-2 6-4 6-1 victory over Alex Bogomolov at the US Open was worth a "six or seven out of 10".
The third seed made it through his opening-round clash in two hours and eight minutes, though he didn't have it all his own way against his Russian opponent.
"I have to stay better hydrated for the next matches."
Andy Murray Quotes of the week
Problems on his serve - including losing his opening two games of the match - and a plethora of unforced errors meant Murray made heavy weather of it in tricky conditions on Arthur Ashe Stadium.
However the Scot - who broke his opponent's serve nine times in total - safely made it through to round two, where he will meet Croatian Ivan Dodig.
"I did okay," he said. "I thought it was a six or seven out of 10.
"I didn't serve particularly well at the beginning but I won in straight sets against a tough player, and that's what I needed to do.
"The conditions were tricky, it was very windy. It's about getting used to playing on that court when it's breezy and you have to do a lot of running and defending.
"I struggled with that but did well when I needed to."
Murray was feeling his left leg at one point in the third set but moved to allay concerns over his fitness, insisting that he had just cramped up a little due to the humidity.
"I was struggling a little bit," he added. "There were a lot of long games and long points, especially at the beginning of the match. We both did a lot of running.
"I sweated a lot and it was just a little bit of cramp. I have to stay better hydrated for the next matches."