BEIJING, Oct. 4 -- Round of 16 action at the ongoing China Open saw two home favorites score major upsets against current top-10 players here on Thursday.

The results set up a quarterfinal that includes two local players for the first time since the tournament was upgraded to a WTA Premier Mandatory Event in 2005.

The day started with favorite Zhang Shuai powering into the quarterfinals, upsetting world No. 3 Angelique Kerber of Germany 6-1, 2-6, 6-0.

Zhang showed strong shooting on return from the outset, breaking her opponent's first service game to race to a 3-0 lead out of the gate.

Both players held serve to 4-1 for Zhang, who got yet another break to go four set points up. She then tilted the momentum on court solidly in her favor to take the first set with ease.

The second set was much more of a struggle for both players, but Zhang came out worse, double faulting four times on the way to letting Kerber force a decider.

Zhang managed to turn things around decisively in the third, breaking all of her opponent's service games and winning 86 percent of her own first service points. Kerber coughed up 13 unforced errors in the third set to only three for Zhang.

Next up for Zhang is world No. 8 Naomi Osaka of Japan, who logged 6-1, 6-2 victory over Germany's Julia Goerges.

Osaka, the 2018 US Open women's singles champion, recovered from some shaky serving out of the gate, getting 84 percent of her returns in play on the way to the victory.

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