Editor’s Note: After this preview was published, Serena Williams withdrew from Cincinnati with a shoulder injury. Below are Steve’s thoughts on the second, third and fourth quarters of the draw, which you can view here:

Second Quarter

Garbiñe Muguruza is 3-3 since winning the French Open; that qualifies as a tailspin for a player of her quality and potential. She did win two matches at the Olympics, but was sent packing in a hurry by 34th-ranked—and eventual gold medalist—Monica Puig, 6-1, 6-1. Has Muguruza hit bottom again, or does she have farther to fall before she turns things around? We’ll get an idea when she plays the winner of the first-round match between Sara Errani and CoCo Vandeweghe. Muguruza’s third-rounder could be tell us more; she’s slated to play Anastasia Pavlyuchenkov, who has been in form for much of 2016.

Also here: Belinda Bencic, who will play her first event since retiring in the second round at Wimbledon.

American wild card to watch: Louisa Chirico. Can this clay-court specialist, and Madrid semifinalist, make the transition to hard courts? She hasn’t won a match since the French Open.

Semifinalist: Pavlyuchenkova

Third Quarter

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Cincinnati WTA Preview: With Serena Williams out, Simona Halep a player to be reckoned with

Cincinnati WTA Preview: With Serena Williams out, Simona Halep a player to be reckoned with

Simona Halep should be a player to reckon with this week. She skipped Rio, and she comes to Cincinnati having won two straight events—in Bucharest and Montreal—10 straight matches and 14 of her last 15. She’ll try to keep that run going against either Annika Beck or Yulia Putintseva in her first match. Halep’s third-rounder, which could be against the woman who beat Serena in Rio, Elina Svitolina, should be a test; the Romanian and the Ukrainian have never played.

*Also here: Agnieszka Radwanska, Johanna Konta

First-round match to watch: Lucie Safarova vs. Andrea Petkovic*

Semifinalist: Halep

Fourth Quarter

The No. 2-ranked Kerber should take pride in the fact that she has inspired Serena to take a wild card into this tournament. But will the German have any energy left in Cincy? She's coming off a silver-medal performance in Rio, and a semifinal run in Montreal the week before that, all on what had been a bad elbow. Kerber, who has beaten Serena in Cincy before, will start against either Kristina Mladenovc or Kateryna Bondarenko. Her draw to the semis looks manageable, even if she isn’t 100 percent.

*Also here: Roberta Vinci, Sam Stosur, Carla Suarez Navarro, Eugenie Bouchard

First-round match to watch: Daria Kasatkina vs. Tsvetana Pironkova*

Semifinalist: Stosur