STUTTGART, Germany — Top-ranked Naomi Osaka opened her clay-court season by beating Hsieh Su-wei of Taiwan 6-4, 6-3, on Thursday to reach the Porsche Grand Prix quarterfinals.
Osaka hit 22 winners and converted three of her six break points to seal the win in 1 hour, 24 minutes and set up a meeting with Donna Vekic of Croatia.
After saving two break points early, it was an unusually smooth victory for Osaka over Hsieh. She needed three sets to get past the Taiwanese veteran en route to her Australian Open victory and then lost to her at the Miami Open last month.