Coco Gauff vs. Marta Kostyuk Prediction, Pick for Cincinnati Open – 8/21/26

The Cincinnati Open quarterfinals continue on Friday, and Coco Gauff vs. Marta Kostyuk could be one of the slate’s best matches. 

Gauff is still seeking her first title of the year, but the world No. 4 has consistently made deep runs in tournaments and was the Cincinnati Open champion in 2023. Kostyuk is on the verge of cracking the top 10 for the first time as she enjoys what’s easily been a career-best campaign. 

Below, we’ll break down our Coco Gauff vs. Marta Kostyuk prediction, including recent form, match analysis, and a PrizePicks pick. The match is slated to start at 8:30 p.m. ET on Tennis Channel.

Make your Cincinnati Open predictions on PrizePicks for Friday’s match now!

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Coco Gauff vs. Marta Kostyuk Prediction, Favorite for the Cincinnati Open Quarterfinals

Below are the payouts for who will win Friday’s Gauff vs. Kostyuk match, via PrizePicks Team Picks. 

On PrizePicks Team Picks, a 2x payout represents a return of $200 on a $100 entry (or $20 on $10). A lower payout multiplier signals a higher implied probability of that result based on user picks.

Payouts are live at the time of writing and are subject to change. Tennis winner markets are available in 36 states.

Coco Gauff vs. Marta Kostyuk Cincinnati Open Prediction – Friday, August 21

Match Winner Payouts: Gauff 1.66x | Kostyuk 2.12x
Tournament Round: Quarterfinals
2026 Record Entering the Cincinnati Open: Gauff 34-13 | Kostyuk 29-7
Head-to-Head Record: Gauff leads 3-2
Scheduled Time: 8:30 p.m. ET
How to Watch: Tennis Channel

It’s a bit surprising that Gauff remains without a title in 2026, as she’s otherwise performed well in several big tournaments throughout the year. She was a Wimbledon semifinalist just last month and also finished runner-up at both Miami and Rome.

Most recently, Gauff reached the semifinals of the Canadian Open, and with this run to the Cincinnati Open quarterfinals, she’s now amassed a 22-7 record on hard courts this year.

Meanwhile, Kostyuk now sits just outside the top 10 and has continued an incredible run of form that dates back to the beginning of the clay swing in April. Over this span, she’s won 27 of her last 30 matches while winning titles in Madrid and Rouen. All three losses came against eventual tournament champions, too. 

Here in Cincinnati, she’s fresh off a comeback win over Mirra Andreeva, earning Kostyuk her eighth top-10 victory in 2026. She’s now 5-2 vs. top-10 opponents since everything started to click at the beginning of April.

There’s little doubt that Kostyuk could present a stiff challenge for Gauff. The American is 8-8 vs. top-20 opponents this year and will now be up against one of the most in-form players on tour. 

That being said, according to Tennis Abstract’s Elo ratings, Gauff ranks higher than Kostyuk on hard courts, giving her a 60.3% win probability. She’ll also benefit from having home-court advantage as an American. 

The edge could still go to Gauff, who's reached at least the semifinals in three of her last four hard-court tournaments. However, a red-hot Kostyuk probably won't make it easy on her.

Make your Gauff vs. Kostyuk Cincinnati Open prediction on PrizePicks now!

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Coco Gauff vs. Marta Kostyuk Pick for the Cincinnati Open on Friday

Three of the five matches these two have played have gone three sets. Overall, their encounters have reached 30, 34, 32, 17, and 20 total games.

Kostyuk's three Cincinnati matches have tallied 31, 24, and 24 total games.

Gauff and Kostyuk both struggle with their serves at times. Among the top 50 players this year, the American owns the second-worst double-fault rate (7.9%) while the Ukrainian has the 13th-worst mark (5.8%).

At the same time, these are two of the sport's best returners. In 2026, Kostyuk has won 48.1% of her return points while Gauff has won 46.9%. Those figures rank second and third, respectively, among the top 50.

As a result, no lead will necessarily be safe in this matchup, potentially leading to frequent break point chances on both sides.

Gauff vs. Kostyuk Pick – 22 Total Games

Make Your Cincinnati Open Predictions Today on PrizePicks

Coco Gauff and Marta Kostyuk will face off in the final match of the day. Who emerges victorious and gets one step closer to the Cincinnati Open title?

Don’t wait until Friday’s matches start — make your Cincinnati Open predictions on PrizePicks now.

Pick your players, predict More or Less on their stats like games won or aces, or make match winner predictions with Team Picks, available in 36 states!

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