Elsewhere in Berlin, the world’s No. 1 Aryna Sabalenka defeated Swiss Rebecca Masarova (8-6) 6-2 7-6 (8-6) in a two-day match.
The Belarusian played the first set on Wednesday before pausing a bad light game.
Sabalenka, who was defeated by Gauff in the French Open final, returned on Thursday and returned from distribution rates, ending a straight-forward victory.
Sabalenka will face Kazakh Elena Rybakina in the quarterfinals after the former Wimbledon champion beat Czech Katerina Siniakova 6-4 7-6 (7-5).
Marketa Vondrousova won the Wimbledon championship in 2023, beating Russia’s Diana Shnaider 6-3 6-7 (3-7) 6-3.
Elsewhere in the Halle Open, Russia’s Andrey Rublev was another big hitter who fell and failed to convert two match points in a 3-6 7-6 (7-4) 7-6 (8-6) loss to Argentina Tomas Martin Etcheverry.
But Germany’s third-ranked world leader Alexander Zverev resumed defeating Italy’s Lorenzo Sonego 3-6 6-4 7-6 (7-2).
