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Novak Djokovic was paying the price for sustained excellence on Sunday, but after retiring injured from the Cincinnati Masters final, the weary and aching world No 1 vowed to bounce back at the US Open.

Djokovic, battling fatigue and a painful right shoulder that hindered his serve and forehand, called it quits while trailing Scotland's Andy Murray 6-4, 3-0.

It was just the second defeat of the season for the Serbian, who arrived in Cincinnati after capturing the Montreal Masters the previous week and was trying to complete a third set of back-to-back Masters titles after his Indian Wells-Miami hard court titles were followed by victories at Madrid and Rome.

In all he has won nine titles this season, including the Australian Open and Wimbledon.

His victory at the All England Club saw him rise to the top of the rankings, but his spectacular success has a downside.

"I've played so many matches this year," Djokovic said. "I've been winning a lot and reaching the final stages of each event that I've participated in.

"Considering the schedule that is very busy in tennis, it's kind of normal to expect that at some stage you are exhausted. But, as I said, I am confident that I can recover and be ready for US Open."

Djokovic's only prior defeat this season was to Roger Federer in the semifinals of the French Open.

That halted his season-opening winning streak at 41 matches - one shy of tying John McEnroe's 1984 record of a 42-match winning start to a season.

Since then Djokovic has won 16 straight matches, but even in Montreal he was feeling a niggling discomfort in his shoulder.

Now the state of Djokovic's shoulder will become a major topic as the US Open looms. He said he hadn't pursued an MRI exam.

"I didn't have time," he said. "I was playing every day."

But Djokovic said the stresses of the season were the same for all top players. Even plans to amend the calendar next season won't help that much.

（中国日报网英语点津 Helen 编辑）

About the broadcaster:

Nelly Min is an editor at China Daily with more than 10 years of experience as a newspaper editor and photographer. She has worked at major newspapers in the U.S., including the Los Angeles Times and the Detroit Free Press. She is also fluent in Korean.