Sabalenka, Zverev knocked out of Cincinnati Open as Gauff reaches quarters

Both top seeds in the women's and men's draw fall in the last 16 of Cincinnati Open as Aryna Sabalenka and Alexander Zverev suffer defeats; watch the US Open live on Sky Sports Tennis from August 30

World No 1 Aryna Sabalenka has been knocked out of the Cincinnati Open after suffering a shock straight-sets defeat to Czech player Sara Bejlek.

The 35th-ranked and unseeded Bejlek defeated the four-time Grand Slam champion Sabalanka 7-6 (7) 6-4 in just under two hours to advance to the quarter-finals of the WTA 1000 event.

Bejlek rallied from 5-1 down in a first-set tiebreaker then came from 4-1 behind in the second set to clinch her first career victory over a top-10 opponent.

The 20-year-old from Znojmo will next face Madison Keys in the quarter-finals.

THE BIGGEST WIN OF HER CAREER. 🤯 Sara Bejlek stuns World No. 1 Sabalenka to reach the Cincinnati QF. #CincyTennis pic.twitter.com/TNDdNCb2LV

"I feel incredible. I lost totally my words," she said on court after the match. "I just kept believing and that was the key today."

Sabalenka's defeat means Elena ⁠Rybakina can replace her as world ⁠No 1 by reaching the Cincinnati final.

Coco Gauff advanced to the quarter-finals after sweeping past 22nd-seeded Czech Marie Bouzkova 6-3 6-2.

The fourth-seeded Gauff needed just one-hour and 33 minutes to progress and will face Ukraine's Marta Kostyuk next for a spot in the semi-finals.

Tommy Paul saved ‌a match point to defeat top seed Alexander Zverev ‌4-6 7-6(6) 6-4 and reach the quarter-finals of ​the Cincinnati Open after a nearly 90-minute rain delay.

Zverev took ‌the first set and trailed 3-4 in the ​second before the fourth-round match was suspended due to rain.

Paul emerged from the lengthy ​delay looking the sharper ⁠player, saving a match ⁠point before levelling the contest as Zverev struggled to find ‌his rhythm.

The German took a 4-2 lead in the third set but Paul ‌dug his heels in to take control of the match, rallying to win four straight games in a stunning comeback to ⁠advance to the quarter-finals in ​Cincinnati for the first time.