Friday
At Armeec Arena
Sofia, Bulgaria
Purse: $750,000
Surface: Hard-Indoor
Round Robin
Singles
Group Serdika
Garbine Muguruza (7), Spain, def. Alize Cornet (6), France, 6-3, 7-5.
Flavia Pennetta (3), Italy, def. Karolina Pliskova, Czech Republic, 6-1, 6-3.
Standings: Muguruza, 3-0 (6-1); Pennetta, 2-1 (5-2); Cornet, 1-2 (2-4); a-Pliskova, 0-1 (0-2); w-Makarova, 0-2 (0-4).
Group Sredets
Carla Suarez Navarro (5), Spain, def. Tsvetana Pironkova (8), Bulgaria, 7-6 (2), 6-1.
Standings: Suarez Navarro, 2-1 (4-2); Andrea Petkovic, 2-1 (4-2); Dominika Cibulkova, 2-1 (4-2); Pironkova, 0-3 (0-6).
a-alternate, w-withdrew