Osaka vs kateina siniakov: 2026 US Open Day 5 pick
Naomi Osaka is the clear favorite against kateina siniakov in Thursday's U.S. Open second round, after scraping past Anastasia Zakharova in two tiebreakers. The two-time champion leads their head-to-head 2-1 and holds an 80% Flushing Meadows win rate, while Siniaková arrives off a straight-sets win.
Key Takeaways
- Osaka and kateina siniakov meet in the second round on Thursday, Sept. 3, 2026, with first ball around 11:30 a.m. ET on ESPN3.
- Osaka needed tiebreakers in both sets to beat Anastasia Zakharova 7-6, 7-6 in round one.
- Siniaková opened with a 6-3, 6-2 win over Elisabetta Cocciaretto and trails the H2H 1-2.
- Sports Illustrated lists Osaka as a heavy favorite at -385; one analyst still likes Siniaková +4.5 games.
The Day 5 matinee at Flushing Meadows pairs a two-time U.S. Open champion with a Czech competitor known more for grinding through draws than for deep New York runs. For more odd and outsized sports storylines, browse Bizarre World on BlasterPost.
Who is favored between Osaka and kateina siniakov?
According to Sports Illustrated's match preview, Osaka is heavily favored at -385 for the second-round clash. That price reflects her Flushing Meadows pedigree more than her shaky first-round form.
Osaka owns an 80% career win rate at the U.S. Open, her best mark among the four majors, with titles in 2018 and 2020 and a semifinal run last year. Siniaková's best New York finish remains a third-round appearance in 2018, and her career win rate here sits at about 31%.
What happened in their opening matches?
Osaka barely survived Anastasia Zakharova, winning 7-6, 7-6 after needing a tiebreaker in each set. That boom-or-bust start is why some bettors hesitate despite the chalk price.
Siniaková looked cleaner, dismissing Elisabetta Cocciaretto 6-3, 6-2. The Czech player has already shown she can keep matches short when her baseline game is dialed in.
AP photos from Thursday morning showed Osaka arriving in New York ahead of the second-round meeting with Siniaková of the Czech Republic, confirming the Day 5 billing.
What does the head-to-head say about this rematch?
These two have met three times before. Osaka leads 2-1, with their most recent clash coming at Wimbledon in 2025. That edge, plus Osaka's hard-court power in New York, explains why markets still back her in Queens.
SI writer Iain MacMillan flagged Osaka as boom-or-bust and recommended Kateřina Siniaková +4.5 games at -120 on FanDuel, arguing she can keep the scoreline tight even if she does not pull the outright upset.
How can you watch Osaka vs. Siniaková?
The match is scheduled for Thursday, Sept. 3, at 11:30 a.m. EST and is listed on ESPN3. Total-games markets sat near 20.5 with even money on both the over and under, per the same SI odds board.
Whether Osaka steadies after the Zakharova scare or kateina siniakov forces another grind, Day 5's early women's singles spotlight should clarify who is truly ready for a deep U.S. Open run.