Four-time Grand Slam winner Naomi Osaka fired 16 aces past Serbian qualifier Olga Danilovic to earn a 7-6(6) 7-6(4) victory at the Bad Homburg Open on Monday for her first win on grass this season less than a week before the start of Wimbledon.
The 27-year-old Japanese player, who had lost in the first round at her last two tournaments -- the French Open and the Berlin Open -- had won her first title in May in almost two years following a maternity break.
Osaka, who had reached the third round of the Australian Open in January before retiring injured, has not had back-to-back wins on any surface since the Italian Open in May. She is currently ranked 56th in the world.
"It's my first grasscourt win of the year," Reuters quoted Osaka as saying. "I am excited about that. I am super excited to play here and be back for my next round."
Asked whether she was on track to improve her form on the surface, she said: "I hope so. I think I have potential but everyone is really good so I cannot take it for granted."
The pair held serve to take the first set into a tiebreak where Osaka snatched it on her second set point.
Osaka was 40-0 up on her opponent's serve at 2-2 in the second set but she could not bag the first break of either player in the match, with Danilovic holding serve with her eighth ace of the match.
Osaka, however, got the mini-break she needed in the tiebreak when she challenged a Danilovic first serve that was then ruled out, with the qualifier then double-faulting.
She held on to that slim advantage to earn a spot in the round of 16 where she will face fifth-seed Emma Navarro.
Russian eighth-seed Ekaterina Alexandrova also eased into the next round with a 6-1 6-2 win over Swiss Belinda Bencic.
Croatia's Donna Vekic made equally light work of sixth seed southpaw Diana Shnaider for a 6-3 6-3 victory.
Clara Tauson of Denmark needed to work harder and battle from a set down before snatching a 6-7(6) 6-3 6-3 against Poland's Magdalena Frech.
