Andy Murray does not think the success of his partnership with Amelie Mauresmo can be judged until the Australian Open.
Murray employed Mauresmo as his coach in June, initially on a trial period for the grass-court season.
They agreed to carry on working together post-Wimbledon and the Frenchwoman has committed to travelling with Murray for 25 weeks of the year.
A training camp in Miami last month gave them a first chance to put in some serious work away from the match court and there will certainly be scrutiny based on how well Murray does at the US Open.
But the 27-year-old said: “I think it takes longer than just a couple of months. I said the same thing with Ivan [Lendl] as well. I think it takes five, six months before you can really change much.
“Since Wimbledon we’ve only had two weeks of practice, and practice is really where you can start to make changes to your game if there’s things you want to improve.
“It will be nice at the end of this year. We’ll have a few more practice weeks and then also the off-season where you can spend three or four weeks together.
“So I would hope you’d start to see some changes, things I’m trying to work on, see them really improving by the Australian Open.
“But there’s no reason why I can’t have good results right now and she can’t influence things right now.”
Murray faces the first real test of his US Open credentials today when he takes on ninth-seeded Frenchman Jo-Wilfried Tsonga in the fourth round this evening.
Should Murray win, it would be his first victory over a top-10 player since lifting the Wimbledon title last year.
The good news is he is back on Arthur Ashe, one of his favourite courts, but Tsonga feels there is not the same fear factor about Murray that there was.
He said: “The locker room is maybe a bit less afraid of Andy because he’s losing a few more matches than in the past, but I don’t know any player who once on court is going to be super-confident against Andy.
“He’s different than in the past maybe because I feel he’s not serving as strong as he used to, nor maybe hitting as strong as he used to.
“And during matches he’s showing more when he seems in pain with his back or hip region.”
Murray has beaten Tsonga in nine of their 11 previous meetings, but the Frenchman came out on top when they played each other in Toronto last month.
It was Tsonga’s first win over his friend since the Australian Open in 2008 and came despite Murray leading 3-0 in the deciding set.