Czech tennis star Sara Bejlek has produced one of the biggest surprises of the 2026 Cincinnati Open after defeating world No. 1 Aryna Sabalenka in the fourth round.
The 35th-ranked Bejlek defeated the tournament’s top seed 7-6(7), 6-4 on Wednesday, August 19, to reach the quarter-finals of the WTA 1000 tournament. It was the biggest victory of the 20-year-old’s career and her first win against a top-10 player.
Bejlek’s victory was particularly impressive because Sabalenka entered the tournament as the highest-ranked women’s player and one of the leading contenders for the title. The Belarusian star was also using Cincinnati as an important preparation event ahead of the US Open.
Bejlek Keeps Her Composure
The opening set was extremely competitive. Neither player was able to establish complete control, forcing the set into a tie-break.
Bejlek held her nerve in the crucial moments and eventually won the tie-break 9-7 to take a one-set advantage.
Sabalenka tried to respond in the second set, but Bejlek continued to fight aggressively. The Czech player eventually secured the set 6-4, completing a straight-sets victory over the world No. 1.
The win sent Bejlek into her first WTA 1000 quarter-final, marking an important breakthrough in her young career.
Sabalenka’s US Open Preparation Suffers Setback
For Sabalenka, the defeat represents another setback during the build-up to the US Open.
The Cincinnati tournament is one of the final major events before the US Open begins, making it an important opportunity for players to build confidence and match sharpness.
Sabalenka’s early departure means she will now have to use the remaining time before the US Open to recover and prepare for the final Grand Slam of the season.
Her defeat has also created an opportunity for Elena Rybakina, who could challenge for the world No. 1 ranking depending on her performance in Cincinnati.
Bejlek Faces Madison Keys Next
Bejlek’s reward for her stunning victory is another difficult quarter-final against American star Madison Keys.
The match will provide another major test for the young Czech player, who will be hoping to continue her remarkable run and reach the semi-finals.
The Cincinnati Open is being played on outdoor hard courts at the Lindner Family Tennis Center in Mason, Ohio. The tournament runs from August 13 to August 23 and is one of the final major events before the US Open.
A Major Breakthrough
Regardless of what happens against Keys, Bejlek has already made a major statement in Cincinnati.
Defeating the world’s No. 1 player at a WTA 1000 tournament demonstrates that she can compete with the biggest names in women’s tennis. Her performance could also help her ranking and confidence as she continues to establish herself on the WTA Tour.
For Sabalenka, meanwhile, the defeat will be a reminder that the road to the US Open title will be extremely competitive.
