WUHAN - Angelique Kerber survived a scare in her first match as world number one before beating Kristina Mladenovic in three sets at the Wuhan Open on Tuesday.

The US and Australian Open champion, who had a bye in the first round, made a convincing start before missing two set points and allowing Mladenovic to take the first set in a tie break. But the German then swept through the rest of the match, winning 6-7 (4/7), 6-1, 6-4 to set up a third-round meeting with two-time Wimbledon champion Petra Kvitova. “I was trying to find my rhythm because I was not playing my best in the first set,” top seed Kerber said after the match.

Kvitova said she would be trying not to think about Kerber’s new status as world number one, formalised when the rankings were updated after this month’s US Open, when they play on Wednesday. “(It) will be for the first time... that I will play her as a number one, which is a little bit different. But I think if I’m on the court, I don’t really think about that,” she told reporters.

World number four Agnieszka Radwanska also romped into the third round, as last year’s US Open finalist Roberta Vinci became the tournament’s first seeded casualty. One-time Wimbledon runner-up Radwanska won 6-4, 6-1 against Russia’s Ekaterina Makarova, who bagged Olympic women’s doubles gold last month in Rio.

Italy’s Vinci, ranked 15, was ousted by Yaroslava Shvedova 7-5, 6-2 — her second defeat at the hands of the Kazakh this year. Radwanska will next meet an in-form Caroline Wozniacki, who defeated qualifier Kateraina Siniakova 6-4, 6-4 on Tuesday, in the third round of the $2.6 million hardcourt event.

The former world number one beat Poland’s Radwanska in the semi-finals of last week’s Pan Pacific Open in Tokyo, en route to her first title of the year. “We always (have) long battles against each other, especially on the slower surface (such) as here,” Radwanska said of Wozniacki.

Seven-time Grand Slam champion Venus Williams downed Yulia Putintseva of Kazakhstan 6-3, 6-2, and will next play fellow tour veteran 10th-ranked Svetlana Kuznetsova of Russia. The pair have not met on court since 2009. American Madison Brengle fell to Kuznetsova 6-0, 6-4 in the second round, as eighth seed Madison Keys beat Caroline Garcia 6-3, 6-4.

Former Wimbledon quarter-finalist Barbora Strycova downed Japan’s Misaki Doi, while Daria Kasatkina of Russia beat fellow qualifier American Louisa Chirico.

Khachanov fells Sousa to advance in Chengdu:

Up-and-coming Russian Karen Khachanov felled 7th-seeded Joao Sousa of Portugal at the ATP Chengdu Open Tuesday to advance to the second round.

The 20-year-old, 1.98m (6’6”) right-hander powered past Sousa 7-6(3), 6-3 in 77 minutes to face Frenchman Adrian Mannarino in the second round.  “It’s a very good match for me,” Khachanov said, according to an ATP report. “I’m very happy with my performance. I like the court, I like the crowd, so I was enjoying playing the match.”

Thirty-year-old South African Kevin Anderson smoothly dispatched Jordan Thompson of Australia 6-2, 6-4. He will face Australia’s Nick Kyrgios, the second seed and number 15 in the ATP rankings, in the next round.  Serbian Dusan Lajovic fought back from a dropped first set to beat Federico Del Bonis of Argentina 1-6, 6-3, 6-4.

In the second round he will face third seed Grigor Dimitrov of Bulgaria, now ranked 21st in the world. Former Australian Open finalist Marcos Baghdatis of Cyprus traded hard-fought sets with Spaniard Pablo Carreno Busta when the match was suspended in the final set due to rain.