Tim Henman refused to get carried away despite reaching the quarter-finals of the French Open for the first time.
The British number one beat France's Michael Llodra in five sets for a best grand slam result outside Wimbledon.
He next plays Argentina's Juan Ignacio Chela but was looking no further than Tuesday's last-eight match.
"That's totally the wrong way to approach it," he said. "If you start thinking down the road then you're not going to concentrate on your job."
Henman added: "Who knows what's going to happen? I need to play better on Tuesday. I need to be more committed to my style.
"If I do that and lose then I don't have any complaints."
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I was just being reactive rather than
proactive
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Henman, who turns 30 in September, has reached seven quarter-finals and four semi-finals at Wimbledon but had never gone further than the fourth round in the Australian Open, French Open or US Open.
He added: "Against Llodra I just wanted to keep fighting as hard as I could to try to
come away with a win.
"That's what I did. But I'm through to the
quarters, so there's a lot to be positive about.
"I wasn't moving particularly well. I was just being reactive rather than
proactive. I felt it was him dictating the play. That's something I really need
to avoid because that's not my style.
"I didn't play my best and there are some negatives but it's important to
push those aside and really focus on the positive aspects."
And he revealed that he has shrugged off the illness that has dogged him for the last three weeks.
"I'm pretty close to feeling 100 per cent," he said.
"If
you're going to play matches like that you need to be able to draw on everything
you've got because it was a tough match physically and an even tougher match
mentally."