The British ace overcame concerns about his fitness to defeat Frenchman Corentin Moutet in straight sets at Flushing Meadows and was delighted with the nature of the triumph.
Murray said post-match: "It was amazing. A brilliant atmosphere against one of the most skillful players on Tour.
"He has so many ways to disrupt you, he is an exceptional player and he moves extremely well and always causes a bit of chaos.
"I hope it was entertaining for everyone. There were some fun points in there. I am happy to get through in straight sets because the second set was very tight."
Murray's participation in New York had been in doubt after an abdominal problem but Murray felt the niggle easing as he earned his 200th Grand Slam match win.
The former world number one said: "The preparation was slightly tricky because I had to pull out of the tournament mid-way through in Canada and miss Cincinnati.
"I had to slowly build my serving up but I was quite happy with how I served today, the ab felt good."
The match also featured tennis' new video review system although Murray was unimpressed as the technology malfunctioned at a vital moment.
The former US Open champion said: "It took about four minutes to make a decision.
"I'm pro using technology to get to the right calls - but you've got to have it working. When it goes like that, it turns into a bit of a farce."