Follow CBSMIAMI.COM: Facebook | Twitter

KEY BISCAYNE (CBSMiami/AP) – The women’s side of the Miami Open is getting into its championship rounds.

READ MORE: Attorney: School Gunman Nikolas Cruz To Plead Guilty To Massacre; Parkland Families React

Andrea Petkovic became the first semifinalist at the tournament when she beat Karolina Pliskova 6-4, 6-2 Tuesday.

Petkovic, seeded ninth, arrived at Key Biscayne with a modest 7-6 record this year but has yet to lose a set. Her opponent Thursday will be the winner of the quarterfinal Tuesday night between three-time champion Venus Williams and Carla Suarez Navarro.

READ MORE: Nikolas Cruz Pleads Guilty In BSO Jail Guard Attack

Tomas Berdych advanced to the men’s quarterfinals when Gael Monfils fell and hurt his hip. The No. 8-seeded Berdych was leading 6-3, 3-2 when Monfils retired.

Monfils, seeded 17th, said he bruised his hip but hopes to be able to play in his next scheduled tournament in Houston.

Unseeded Dominic Thiem of Austria advanced by beating No. 28 Adrian Mannarino 7-6 (5), 4-6, 7-5.

MORE NEWS: Parkland Survivor David Hogg On Potential Guilty Plea: 'It's Horrific That Our Community Has To Continue Going Through This'

(TM and © Copyright 2015 CBS Radio Inc. and its relevant subsidiaries. CBS RADIO and EYE Logo TM and Copyright 2015 CBS Broadcasting Inc. Used under license. All Rights Reserved. This material may not be published, broadcast, rewritten, or redistributed. The Associated Press contributed to this report.)