Simona Halep, Garbine Muguruza, Caroline Wozniacki advance to Rogers Cup quarterfinals

Karolina Pliskova poses along with her world number one trophy in Toronto

Pliskova, playing her first tournament since a shock second round defeat at Wimbledon, had shown signs of rust in a ragged opening win over Anastasia Pavlyuchenkova but looked more like a world number one as she swept four straight games to take the first set from 50th-ranked Osaka.

Wozniacki, sixth-seeded, lost the first three games of the encounter, but she turned the tables and eventually win the first round.

Caroline Wozniacki of Denmark has upset recently crowned Czech world number one Karolína Plíšková to reach the semi-finals of the Rogers Cup in Toronto.

She next faces either Czech Lucie Safarova or American Sloane Stephens. In the victory, Wozniacki won 73 percent of her first serve points and 48 percent of her second serve points.

For the first time in her career, Pliskova is set to feature in the Rogers Cup quarters.

"I'm definitely happy I am through to the next round, the first match is always tough".

"It's okay. I've had a lot of rain delays this year, so wasn't really too anxious or too concerned".

Stephens is making up for lost time on the court at the Rogers Cup, though, with her four matches this week taking almost eight hours in total.

Rain continued to impact the tournament, with the bottom half of the quarter-final draw being postponed to Saturday morning.

In other quarterfinal matches, defending champion and second-seeded Simona Halep of Romania faced off with Frenchwoman Caroline Garcia while fifth-seeded Elina Svitolina of Ukraine challenged fourth-seeded Spaniard Garbine Muguruza.

But Pliskova snapped out of her brief funks each time and clinched her first win as number one with her seventh break.

"It was definitely a little easier", Wozniacki said in comparing her victory over Pliskova at the Aviva Centre to running a marathon. However, Caroline employed her feet to the extra work of reaching every ball that was humanly possible to reach and slowly, but ever so steadily, wore Pliskova down. She pulled ahead 3-2 as Wozniacki was forced wide and netted her return.

"I thought she started off really strongly and she was attacking and playing really, really well", Wozniacki said. "I don't really think about (beating a No. 1) too much", Wozniacki said.

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