A place in the last eight of the US Open is at stake for Naomi Osaka and Elena Rybakina as two of the most powerful ball‑strikers in the women's game collide on Louis Armstrong Stadium on Monday.
It is the most highly anticipated women's match of the day, as popular four‑time Grand Slam champion Osaka faces the reigning Australian Open champion.
The Kazakh is chasing her deepest US Open run and a potential rise to World No.1, while Osaka is trying to reach her first Slam quarter-final since returning to the tour.
Rybakina has been efficient through the first week in New York, winning all three of her matches in straight sets and spending just four hours, 14 minutes on court in total.
Osaka, in contrast, has been forced to work harder, playing two three‑setters and logging an extra two hours and 28 minutes of match time.
Surprisingly, their only previous meeting came just weeks ago in Toronto, where Rybakina prevailed in a dramatic two‑and‑a‑half‑hour quarter-final.
Osaka won the first set, broke early, and held match points in the second‑set tiebreak, but Rybakina's resilience and serving power carried her through on that occasion.
Naomi Osaka v Elena Rybakina Tips Summary
Best Bet - Match handicap Elena Rybakina -1.5 @ 10/11
Alternative Bet - Elena Rybakina to win 2-0 @ 2/1
Bet Builder - Elena Rybakina to win, Elena Rybakina 10+ aces & Elena Rybakina 1st service game to win to 0 or 15 @ 19/2
Naomi Osaka v Elena Rybakina Prediction
Best Bet: Match handicap Elena Rybakina -1.5 @ 10/11
After an underwhelming start to the summer, during which Rybakina lost in the first week at both the French Open and Wimbledon, the Kazakh star has found the form that took her to number two in the world again.
She has won 11 of her 13 matches on the American hard-court swing, losing only to Iga Swiatek (twice) over the past few weeks, albeit the second of those defeats came when she walked off court at 4-1 down in the opener.
There have been no signs of the ankle injury in her first three rounds at Flushing Meadows, however, with Rybakina serving with her usual precision and power.
She leads the WTA ace race with 357 this season - far ahead of the field - and even when she is not at her best, her ability to protect her serve maintains control of matches.
That was evident in Toronto last month when Rybakina served 15 aces and won almost 74% of points on her first serve against the Japanese star.
Osaka was unable to close out that match from a position of strength and it is hard to see how she can get enough looks at Rybakina’s second serve to apply sufficient pressure.
While she insists the Achilles tendon issue she has been managing since Wimbledon is not severe, it has affected her movement and may explain her difficulty closing out matches after winning the first set.
Rybakina's first‑strike tennis, superior serve, and fresher legs give her a clear edge. If she maintains her serving rhythm, she should cover the -1.5 game handicap.
Alternative Bet: Elena Rybakina to win 2-0 @ 2/1
The last time these two met, Osaka pushed Rybakina deep, but that was a match the Japanese star nearly won before her Achilles issue worsened.
Since then, Rybakina has tightened her game, reduced her unforced errors and looked far more stable behind her first serve.
Their match-up often hinges on Rybakina's ability to shorten points with her serve and aggressive style.
Osaka's defensive patterns, particularly her deep return stance, can be exploited by Rybakina's flat, penetrating groundstrokes.
The world number two's last three matches have all finished in straight sets and, if she starts fast, this match may be over quickly.
Osaka has struggled to generate consistent break chances this week and her Achilles issue has limited her ability to chase down balls and defend wide serves.
Naomi Osaka v Elena Rybakina Bet Builder
Elena Rybakina to win
Elena Rybakina 10+ aces
Elena Rybakina 1st service game to win to 0 or 15
Pays 19/2
Rybakina has not lost a hard-court match to a player outside the world's top-10 since February and finished very strongly when beating Osaka last month, so she should win if the match goes to current form.
On average, almost 11% of her serves on hard courts result in aces, so there should be every chance she clears the 10+ mark on Monday.
Her delivery is one of the most reliable in the game and she won each of her first three service games against Yuliia Starodubtseva in round three to Love or 15.
Osaka's deep return position may enable her to start some rallies in Rybakina's first service game, but the Kazakh has the ability to hit flat, powerful groundstrokes that should see her close out the game without too much fuss.
Key Match Stats
Elena Rybakina leads the head‑to‑head with Naomi Osaka 1-0
Rybakina has not dropped a set at the US Open this year
Osaka has played two three‑setters this week
Rybakina's 357 aces leads the WTA this year
She served 15 in her last match against Osaka
Rybakina averages 10.6% aces per serve on hard courts in 2026
Read more tennis betting tips and predictions on site.
This article was written by a partner sports writer via Spotlight Sports Group. All odds displayed on this page were correct at the time of writing and are subject to withdrawal or change at any time.
