World No.1 Simona Halep and world No.10 Angelique Kerber have muscled through to the third round at Wimbledon, but local hope Johanna Konta has fallen in straight sets.

Halep showed all the marks of a champion when she emerged unscathed from a first-set fright to reach the third round of Wimbledon with a 7-5 6-0 win over China’s Zheng Saisai on Thursday.

The French Open winner’s hopes of completing a grand slam double appeared to be in trouble when she fell 5-3 behind in the first set.

But the newest member of the grand slam winners’ circle showed her new-found maturity to win the next 10 games on the trot and completely locked out Zheng from the contest.

The Romanian world number one will next face Hsieh Su-wei from Taiwan.

Kerber was less dominant against American Claire Liu and admitted to being caught cold as their match went to three sets.

The 2016 finalist was staring a defeat in the face after losing the first set, but came back to win 3-6 6-2 6-4.

Kerber will next meet Naomi Osaka in the third round after the Japanese beat British favourite Katie Boulter 6-3 6-4.

Meanwhile, Britain’s Johanna Konta joined the exodus of women’s seeds, beaten 6-3 6-4 by Dominica Cibulkova, a player with a point to prove.

Konta became the first British woman to reach the Wimbledon semi-finals since 1978 last year, losing to Venus Williams, but her hopes of repeating that thrilling run were crushed by an inspired Slovakian on a subdued Centre Court.

Cibulkova missed out on the 32nd seeding when Wimbledon’s seedings committee bumped seven-times champion Serena Williams up the order and she played with a fierce intent throughout.

Konta, seeded 22, could do nothing to stem the tide of winners as Cibulkova stormed ahead.

Cibulkova will play Elise Mertens for a last 16 spot.