Fifth-seeded Agnieszka Radwanska sailed into the second round of WTA hardcourt tournament on Monday but eighth-seeded Dominika Cibulkova worked hard to get past Japanese veteran Kimiko Date Krumm.

Poland's Radwanska, ranked 14th place in the world, defeated Czech Barbora Zahlavova Strycova 6-1, 6-2.

"It was a good match," said Radwanska, who is seeking her first WTA title in three years but has seen good results this season, including an appearance in the quarterfinals of the Australia Open and fourth round at Roland Garros.

"I am very happy to have won my first hardcourt match, and especially under hot conditions. I just wanted to play very good tennis at this tournament."

Radwanska will face Chang Kai-Chen of Taiwan, who recovered from an early deficit to avoid Hilary Barte 7-5, 6-4.

Slovakia's Cibulkova, ranked 19th in the world, played for the first time since the fall in the quarterfinals at Wimbledon with Maria Sharapova.

Her 6-2, 7-6 (9/7) victory over Date-Krumm was his eighth victory in 10 games. She has not lost more than two consecutive games this season.

But she admitted that she almost lost his composure after falling behind 5-1 in the tiebreaker.

"I'm a player who really needs to control my emotions," Cibulkova said. "I went a little crazy once I lost my serve at 6-6.

"Throughout the whole tiebreaker, I was off a little bit but I just tried to focus 100 percent."

She managed to hang on, but said it was not easy against a player of Date-Krumm's experience.

"It's not easy to play Kimiko," Cibulkova said. "She's a tough opponent. In the first set, I just played aggressively like I should and was going for my shots.

"In the second set, I started to be more careful with my returns and she was more in the game."

Cibulkova booked a match with American Christina McHale, a 6-1, 6-0 winner over Croatia's Mirjana Lucic.

"I just tried to stay solid and steady, play each point with full intensity," McHale said. "I think I'm improving my tennis, which is most important."