All the facts and figures from the Western & Southern Open as the singles semifinals take place, with Karolina Pliskova, Simona Halep, Garbiñe Muguruza and Sloane Stephens in action.
WTA Staff
August 19, 2017

Play starts at noon

CENTER COURT

Karolina Pliskova (CZE) [1] vs. Garbiñe Muguruza (ESP) [4]

After Men's Singles match
(not before 4pm)

Sloane Stephens (USA) vs. Simona Halep (ROM) [2]

After Men's Singles match

Su-Wei Hsieh (TPE) / Monica Niculescu (ROU) vs. Yung-Jan Chan (TPE) / Martina Hingis (SUI) [2]

Late night summer nights

A post shared by Sloane Stephens (@sloanestephens) on

MATCH POINTS

Simona Halep needs to win the title in Cincinnati to move to No.1 in the WTA Rankings. It is possible that current leader, Karolina Pliskova, takes on Halep in the final on Sunday with the No.1 ranking on the line.

Karolina Pliskova also faced Garbiñe Muguruza in last year's Cincinnati semifinals, winning in straight sets before going on to take the title. Muguruza's only victory in seven meetings with Pliskova came in the pair's first meeting - at the 2013 French Open. The Czech has won all six of their encounters since - all on hardcourts.

Last year's run to the semifinal was the only previous time Garbiñe Muguruza has made it past the first round in Cincinnati.

Simona Halep has reached the semifinal in Cincinnati for the third successive year - previously beating Jelena Jankovic in the last four in 2015 before losing to Angelique Kerber at the same stage last year.

Simona Halep has won her last three meetings with Sloane Stephens, having lost two of the pair's first three encounters. The Romanian's last two wins over Stephens both came in the US - in Miami in 2015 and Washington earlier this year. All six of their matches have been decided in two sets. 

Sloane Stephens continues her best run in Cincinnati, having gone out in the last 16 in 2012, 2013, 2014 and 2015 previously.

Sloane Stephens' form follows her making the semifinals of the Rogers Cup in Toronto last week - her first four victories on the WTA tour since her return from 11 months out with injury.

Su-Wei Hsieh takes part in her third doubles final in Cincinnati, having lost alongside Yaroslava Shvedova in 2008 before winning alongside Peng Shuai, of China, three years ago. 

Yung-Jan Chan has also enjoyed past doubles success at the event, winning alongside sister Hao-Ching Chan two years ago. Martina Hingis was a finalist last year, losing with home favourite CoCo Vandeweghe to Sania Mirza and Barbora Strycova.