BEIJING, Oct. 7 -- Georgia's unseeded Nikoloz Basilashvili caused a major upset here on Sunday night, defeating an out-of-sorts Juan Martin del Potro 6-4, 6-4 to claim the 2018 ATP China Open title.

On paper, del Potro began the match as the hot favorite, with the tournament's No. 1 seed having enjoyed a day's rest after his semifinal opponent Fabio Fognini withdrew injured.

By contrast, unseeded Georgian Basilashvili had endured an energy-sapping matchup with Britain's Kyle Edmund en route to the final.

But Basilashvili clearly hadn't read the script when he broke del Potro's serve in just the third game.

The Argentinian had been struggling with a cold all week, and though he served five aces, he seemed rattled by the ferocity and frequency of Basilashvili's baseline strokes.

While not all of them found their intended target, the Georgian did enough to take the first set in 46 minutes.

The second set began as the first had ended, with both players serving big and seeking to stretch their opponent with powerful baseline strokes.

Though del Potro served up another four aces across his first two service games, Basilashvili was equally effective on serve as the two traded blows.

Matters came to a head in a pulsating eighth game, when del Potro failed to convert three break points that would likely have shifted momentum the Argentinian's way.

This seemed to affect del Potro, whose miscued drop-shot in the following set saw Basilashvili break serve once again to serve for the match at 5-4.

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