In another engrossing game that ebbed and flowed, del Potro saved two match points before failing to convert two break points of his own.

Basilashvili would not be denied a third time, however, and after making del Potro work as he had done all game, eventually closed out the match in one hour 41 minutes.

This is the Georgian's second ATP World Tour 500 Series win this year, after his victory in the German Open in July.

Speaking afterwards, del Potro acknowledged that illness had affected his performance. "As you can see, my game today wasn't good as it had been in the last few matches. I had some problems the last three days, and it affected my game."

However, the Argentinian also paid tribute to Basilashvili, saying the Georgian was a worthy victor. "Nikoloz played unbelievable. He played a really strong game, and played smart points in the important moments. I think he deserved to win because I couldn't play at my best level."

Despite his defeat, del Potro can console himself with the fact that he now has enough ranking points to have qualified for the 2018 ATP finals in London next month.

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