Alexander Zverev refused to get carried away despite thrashing Kei Nishikori 6-4, 6-1, 6-1 at the French Open.
Zverev was in quite brilliant form, striking the ball with incredible authority and dominating the match from start to finish.
He was reluctant to put the performance down as one of his best ever, although he knows he has every reason to be confident as he moved into the quarterfinals.
Speaking on court after the match, Zverev said: "I played incredible! I played a very good match, but the tournament is not over.
"I'm in the quarterfinals so I hopefully have three more matches left and we'll see how those go.
“I hope I continue playing the same way I did this match. Maybe even better,”
“Now we're in the quarterfinals, there's only eight of us left, and the opponents are not getting easier. You need to perform at your best, play at your best.”
Zverev will face Alejandro Davidovich Fokina in the last eight, and he knows he cannot afford to take the Spaniard lightly.
"I mean, I have Davidovich Fokina for a reason," he said. "He won four matches, right? Let's give him some credit where they deserve credit.
"You cannot be a bad player and be in the quarter-finals of a Grand Slam."
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