SHANGHAI, Oct. 10 -- World No. 2 Roger Federer barrels into the third round of ATP Shanghai Masters here on Wednesday, beating Daniil Medvedev of Russia in a nail-biting 6-4, 4-6, 6-4 in his opening match of the tournament.

"It was a great first round for me against a guy who has been playing excellent. I was impressed by how he played," said the defending champion, who has never played Medvedev before.

The 20-time Grand Slam winning Swiss earned the first break at the outset of the match and completed the first set in 34 minutes. But Medvedev, the newly-crowned Japan Open champion, bounced back in the second set with strong hold of serve and a decisive break to make it 6-4.

In the decider, Federer broke in the ninth game after a Medvedev shot long and then closed out the match in one hour and 53 minutes with an ace. The 37-year-old top seed will next play Spain's Roberto Bautista Agut on Thursday in the last 16 to chase his third title in the ATP 1000 showpiece

China's wild card entry Wu Yibing was defeated by eighth seeded Kei Nisshikori of Japan 3-6, 6-0, 6-3 in one hour and 40 minutes.

The 18-year-old Chinese young talent stunned the former World No. 4 in the first set with superior shots and returning to make it 6-3. But Nisshikori was back on track in the second set and dominated the rest of the match to reach the next round.

"I was not able to do anything in the first set, he was playing top 50, top 30 tennis," Nisshikori spoke highly of his opponent. "I thought about losing the match maybe, so I was happy with my tennis in the end."

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