Melbourne, Jan 18: World number one  got the birthday gift she wanted Wednesday by making the Australian Open third round, but she had to work hard against fellow German Carina Witthoeft. Also Read - Australian Open 2021: Novak Djokovic Beats Daniil Medvedev For Record-Extending Ninth Title at Melbourne Park, Wins 18th Grand Slams Title Overall

The defending champion, who turned 29, battled through 6-2 6-7 (3/7) 6-2 and will next face either Czech Kristyna Pliskova, sister of fifth seed Karolina Pliskova, or Romanian 27th seed Irina-Camelia Begu. Also Read - Australian Open 2021 HIGHLIGHTS FINAL 2021 Novak Djokovic vs Daniil Medvedev Live Updates: Djokovic Beats Medvedev in Straight Sets to Win 9th Australian Open Title

The prospects looked bleak for the unseeded Witthoeft, who has twice lost to Kerber at Wimbledon including an embarrassing 6-0, 6-0 ‘double bagel’ in 2015. Also Read- Australian Open 2017: Rohan Bopanna, Pablo Cuevas advance to second round in men’s doubles Also Read - Daniil Medvedev Registers Clinical Win Over Stefanos Tsitsipas to Set up Australian Open Title Clash Against Novak Djokovic

Witthoeft has never beaten a top 10 opponent but she showed far more fight than at the All England Club, with Kerber taken to three sets for the second match in a row. Kerber stunned Serena Williams in the final last year and also went on to win the US Open, dethroning the American as the world’s top ranked player.

She is not only defending a major title for the first time but also playing her maiden Grand Slam as top seed, admitting she is still getting used to dealing with the extra pressure.  Also Read- Australian Open 2017: The sexist controversy that hit the year’s first Major is worth a revisit

“To have this pressure is a privilege. It’s completely new for me, but I’m doing well. I’m just trying to enjoy it,” she said, before the Rod Laver Arena crowd sang “Happy Birthday”.

“I am getting older… I think I will have a great day today,” Kerber added.

The top seed came out of the gates at full pelt, breaking the 21-year-old in the first game when her opponent netted a backhand.

Ranked 89, Witthoeft was pushed around the baseline by the left-hander but some unusually wild shots from Kerber handed her break opportunities, one of which she grabbed to level the match.

It was an aberration with the birthday girl immediately breaking back, before turning up the heat as they traded blows to score another break when Witthoeft whipped a forehand long to go 2-5 down, with Kerber easily holding to take the set.

Bidding to be the first woman to defend her Australian title since Victoria Azarenka in 2013, Kerber had an indifferent lead-up to Melbourne with early exits in Brisbane and Sydney this month.

She has slowly been improving as he works her way deeper into the Australian Open and towards a potential quarter-final against Garbine Muguruza, with Williams seeded to meet her in the final.

She came out firing in the second set, ambushing Witthoeft for an early 2-0 lead. But she lost focus and her countrywoman made the most of it, breaking back with some pinpoint shots from the baseline.

The set turned into a slug-fest and Kerber succumbed to the pressure in the tiebreak, firing blanks on her serve which allowed Witthoeft to win six points in row and take the set.

Kerber was rattled and lost her opening service game to love, but she quickly regrouped as the crowd got behind her to break back. A tired Witthoeft had no response and her previously stern resistance crumbled into surrender.