"I feel that in the first match of singles, I had trouble playing openly while the opponent was quite aggressive in his efforts. He is a young athlete that I have never played against before, so there was some potential threat in this uncertainty," said Xu.

"By the time we got to the last game, he had a chance of winning the match but did not take control of the opportunity. His excitement on the court became more intense and wavering, especially the second round of falling behind six to one."

Local hero and German No. 1 Dimitrij Ovtcharov also fought off tough challenge from Czech Lubomir Jancarik before winning 4-2 (11-9, 11-5, 6-11, 7-11, 11-5, 13-11).

Another German star Timo Boll wasted no time to dispose of Scotland's Gavin Rumgay 4-0.

Boll, 36, who has won the German champion 11 times, then paired with Ma to beat Indian duo Sharath Kamal Achanta and Sathiyan Gnanasekaran 4-1 to reach the second round of the men's doubles.

Boll and Ma, who were stopped in the second round two years ago in Suzhou, will next take on Chinese pair Xu Xin and Fan Zhendong.

"I think we played better today than in the first round, although the opponents are stronger. We have more harmony and fluency," Boll said.

"I am very much looking forward to the next match. We know the Chinese pair are strong but if we want to win the champion, we need to beat all the rivals."

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