US Open Semifinals: Sabalenka's Power Test and Gauff's Duel with Rybakina | September 11

A heavyweight semifinal night under the lights at Arthur Ashe brings two massive, violently different storylines. On one side of the draw, elite first-strike power crashes into an impenetrable retrieval machine. On the other, an established New York rivalry soaked in psychological scar tissue takes center stage.

I love a slate where technique matters exactly as much as the ability to suppress panic. Here are the two blockbusters dictating the night:

23:00 — Aryna Sabalenka — Jessica Pegula
00:30 — Cori Gauff — Elena Rybakina

Times are UTC.

Aryna Sabalenka — Jessica Pegula

The sheer weight of history dominates this matchup. Pegula arrives in the semifinals carrying an absurdly specific burden: trying to slay her personal New York dragon against a woman who has repeatedly crushed her dreams on this exact stage. Sabalenka is the heavy favorite at 1.512, powered by a terrifying 91 percent hard-court win rate this season.

In her quarterfinal, Pegula was pushed to the psychological brink by Emma Navarro in slow, humid conditions. She looked unusually agitated, struggling to trust her serve before finally telling her negative side to "just shut up" to survive the baseline exchanges (US Open). Pegula knows exactly what she is walking into tonight: "She's gotten me here the last couple of years… that's going to be kind of a hurdle for me to get over" (US Open).

Sabalenka walked through her own fire against Linda Noskova, dropping a set and admitting she felt the match slipping away before throwing caution out the window and swinging with absolute freedom. That late-match escape is terrible news for Pegula. Sabalenka genuinely relishes this rivalry: "I'm loving playing against her, because it's a battle, because it's a fight, and I love being under pressure" (Australian Open). Across their 13 career meetings, Pegula snatched the most recent bout on grass in Berlin, but Sabalenka ruthlessly handled her in the 2025 US Open semis and the Miami final. To flip the script, Pegula has to redirect pace and move Sabalenka laterally; if she just absorbs the heat, she gets hit straight off the court.

I expect Sabalenka to control the terms of engagement. The -3 game handicap on the Belarusian at 1.89 looks entirely reasonable. Pegula will grind and make it physical, but Sabalenka's offensive ceiling inside Arthur Ashe is simply too violent for the American to withstand across a full match.

Cori Gauff — Elena Rybakina

This is the purest style clash of the tournament. Gauff enters the semifinals riding the emotional high of a wildly chaotic quarterfinal escape against Mirra Andreeva, where her serve and forehand essentially vanished, yet she survived on pure competitive discipline. "Sometimes you just need a chance, and I think I got my chances today," Gauff noted after refusing to donate the final point (The Guardian).

Rybakina brings a vastly cleaner baseline level. She obliterated Naomi Osaka earlier in the fortnight and managed her internal frustration beautifully against Qinwen Zheng. "It was definitely a battle inside me but I'm glad that I pushed all the negative thoughts away," Rybakina said regarding her quarterfinal (WTA). The looming X-factor is her physical state; a left ankle issue forced her out of Cincinnati, and while it has held up nicely in New York, a grueling defensive war could suddenly expose it.

These two crossed paths in Toronto this summer, where Rybakina dropped the first set before casually stomping the accelerator to win 5-7 6-2 6-2. She knows exactly how to feast on Gauff's fragile second serve. Gauff's path to victory requires dragging Rybakina into the mud: varied return positions, heavy height into the backhand, and turning the Kazakh repeatedly through the corners to test that ankle and spike the crowd volume.

The oddsmakers see this as a razor-thin contest, with Rybakina slightly favored at 1.875. I think the 22.5 games total going over at 1.915 offers a brilliant read. Gauff's defensive instincts guarantee this will be a grueling physical test, while Rybakina's first-strike tennis will secure enough cheap holds to push this deep into a decider.

Demons and Defense

Semifinal night at a Slam always demands answers to the tactical questions players have successfully dodged for two weeks. Pegula has to prove her mental framework can override her accumulated US Open trauma against the heaviest hitter on tour. Rybakina must demonstrate that her body can endure the relentless, corner-to-corner interrogations that Gauff forces upon her opponents.

I expect the crowd volume to peak and at least one of these matchups to detonate into a late-night classic. For the exact mathematical breakdowns and algorithmic plays on every single market, the AI cappers have their numbers running hot on the match pages.