It's quarterfinal Friday in Charleston!

Singles quarterfinals will be played today at the Credit One Charleston Open, while doubles quarterfinals have already been determined. Here are the results:

Olmas/Shibahara (1) def. Sizikova/Sutjiadi
Dolehide/Hunter (3) def. Fernandez/Townsend
Siegemund/Zvonareva def. Melichar-Martinez/Parks
Collins/Krawczyk def. Mladenovic/Zhang (2)

We're expecting showers this evening (they were originally forecast for early in the week). Historically, the tournament has--for the most part--dodged excessive rain (though we've experienced both a tornado and a hail storm), so we're all hoping that historic good luck continues.

There's a lot going on on the Charleston Open grounds besides tennis. Ted Dimond is here, creating paintings of the players and the grounds. Bethanie Mattek-Sands and Alison Riske-Amritraj do a daily "Behind the Baseline" show every day at noon at the Match Point Bar & Grill. The two WTA players talk with fellow players and other guests.

2014 champion Andrea Petkovic does a daily "Happy Hour" show at 5 p.m., also at the Match Point Bar & Grill, in which she has conversations with WTA players. 

The tournament also offers free tennis clinics, as well as a variety of ways to test one's tennis skills. And, of course, there is always live music throughout the grounds.