Second-seeded Maria Sakkari has eased into the second round of the Berlin Open with a 6-3 6-2 win over French qualifier Leolia Jeanjean, while Andrea Petkovic delighted the home fans by upsetting Garbine Muguruza.
Petkovic defeated the fifth-seeded Muguruza 7-6 (10-8) 6-4 for her first win over a top 10 player since beating Petra Kvitova at the US Open in 2019.
The German will next face Aliaksandra Sasnovich of Belarus for a place in the quarterfinals.
Sakkari, who avenged her loss to Jeanjean in their only previous meeting in 2013, will play Australian qualifier Daria Saville next.
Ons Jabeur started her grass-court season with a win as she cruised past Karolina Muchova 6-3 6-3.
The top-seeded Jabeur, who will next play US qualifier Alycia Parks, is to team up with the returning Serena Williams to play doubles in Eastbourne next week.
“Pretty excited to play doubles with Serena,” Jabeur said. “When I got the news, I was over the moon. Such a privilege for me.”
Belinda Bencic defeated German wild card Jule Niemeier 6-4 5-7 6-3 for another second-round match against Anna Kalinskaya. Bencic beat the Russian player in the same round in ‘s-Hertogenbosch last week.
In Birmingham home fans were delighted when Katie Boulter beat seventh seed Alison Riske, last week’s Nottingham finalist.
The British No.4 who is ranked more than 100 places lower than Riske at 141, won 6-4 6-3.
Massive milestone, definitely excited of course,” said Boulter.
“I feel like I’ve got close to a few of the top players and never got over the line. I feel like I can do it, the game is there, and that’s what’s exciting to me.
Top seed Jelena Ostapenko recovered from a dramatic collapse against Canada’s Rebecca Marino to win 6-2 5-7 6-3 having led 6-2 5-1.
Nottingham champion Beatriz Haddad Maia continued her winning run by beating fifth seed Petra Kvitova, who had won the title on her last two appearances in 2017 and 2018, 7-6 (7-4) 6-2.
Fourth seed Elise Mertens fell 3-6 6-4 7-5 to American Caty McNally