Top seed Rafael Nadal of Spain was beaten 1-6, 6-3, 3-6 by Jurgen Melzer from Austria at 2010 Shanghai Masters on Thursday, while other three top-4 seeds won straight sets to get into the last eight.

Rafael Nadal wasn't unbeatable, and Melzer became another prover of the theorem by handing the world number one Spaniard the ninth defeat of the season on Thursday.

The 29-year-old lefthander stroke 14 aces to close the third-round match 6-1, 3-6, 6-4, clinching his first-ever victory over his five-year-younger opponent, who only served one ace.

"A lot of joy and a lot of happiness. I mean, it's such a pressure coming off," said the 13th seed after keeping the world number one away from the quarterfinal. "It's just a great relief going through your body, all those emotions. But it's tough to explain."

"I think the key was to put a lot of pressure on him. You cannot let him play his game."

"So I tried to take the ball early. I was serving really well, especially on big moments. I executed my game plan, which was putting a lot of pressure," said Melzer, talking about his code of the big victory.

Nadal, a little disappointed, congratulated his rival after the match.

"It's true. He played very aggressive," said Nadal. "Just congratulate him and that's it."

Melzer, who reached his career peak in this October, entered the stadium as the underdog, but he found himself 3-1 leading after breaking Nadal in the fourth game. Nadal couldn't figure out a right way to resist the powerful serves from the other side of the court, losing the first set 1-6.

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