Juan Martin del Potro said that he was battling illness after he suffered a shock defeat in the China Open final on Sunday, losing 6-4, 6-4 to unseeded Nikoloz Basilashvili of Georgia.
In the women's final, world number two Caroline Wozniacki defeated Latvia's Anastasija Sevastova 6-3, 6-3 for her 30th WTA singles title.
Argentine top seed Del Potro was far from his best and has been fighting flu or a cold for several days in the Chinese capital.
The world number four said that he did his utmost in difficult circumstances.
"I did everything that I can to be better for the final, it wasn't enough time to feel 100 percent," the 30-year-old said.
"As you can see, my game today wasn't as good as it was in the last matches in the tournament. I had some problem the last three days and it affected a little bit my game."
"But he put me in really tough situations. I needed to really work it, to work hard, win the points."
- Wozniacki ruthless -
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"I think I had a dream of that, but I don't know how realistic I really believed that was going to be."
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