Wimbledon champion Petra Kvitova and French Open champion Li Na were among the first round winners at the BNP Paribas Open on Friday Kvitova beat Barbora Zahlavova Strycova, 61 63; No.5 seed Agnieszka Radwanska beat Sorana Cirstea, 62 64; No.8 seed Li Na defeated Galina Voskoboeva, 36 63 63; and No.9 seed Vera Zvonareva beat veteran Kimiko Date-Krumm, 63 64.
"It's always tough to play Barbora because we're friends and she's very nice, but I'm happy how I played today," Kvitova commented.
"I knew my tactics coming into the match and did well. I'm feeling good about my game."
"I was always losing first round here the last few years and really didn't want to do it again," Li said.
"I played her in Fed Cup in China and it was also a tough match. At the beginning today she was hitting the ball so hard!"