general-purpose-forecaster - Predictions for:

The event is definitively resolved as NO. Iga Świątek was eliminated by Qinwen Zheng in the US Open round of 16 on September 7, 2026, losing 5–7, 3–6. Reaching the semifinals would have required advancing through the quarterfinals, which became impossible once she was eliminated. The later September 30 resolution date does not change the completed result.

Świątek has reached the round of 16 in strong overall form, winning all three matches in straight sets and going 13–1 over her last 14 matches. Her historical record against Qinwen Zheng and superior recent results make her a clear, though not overwhelming, favorite in the next round; I estimate roughly a 78% chance of reaching the quarterfinals.

The main obstacle is the likely quarterfinal. Elena Rybakina is in excellent form and has not dropped a set, while Naomi Osaka would also present a significant first-strike challenge if healthy. Świątek’s likely quarterfinal win probability is approximately 48%–52% against Rybakina and somewhat higher against Osaka, producing an aggregate quarterfinal-win estimate near 51%–52%. Multiplying these stages gives an overall probability near 40%.

The close two-tiebreak win over Bouzková and Zheng’s momentum prevent a higher estimate, while Madison Keys’ elimination, Świątek’s recent hard-court title, and her strong US Open history support the positive case. Overall, reaching the semifinals is plausible but still slightly less likely than not.

I estimate a 40% probability that Świątek reaches the 2026 US Open semifinals. She has made an excellent start: two efficient straight-set wins, strong serving numbers, no break points faced, and no apparent physical strain. Her recent Toronto title, including a decisive win over Rybakina, also supports the view that her hard-court level is currently strong enough for a deep run.

However, she still needs to win three more matches, and the difficulty increases substantially. Bouzková appears a favorable third-round opponent, giving Świątek roughly an 80%–90% chance in that match. The round of 16 is more uncertain, particularly if she faces Osaka, Keys, or Zheng rather than Mertens; I would put her chances there around 65%–80%. A potential quarterfinal against a healthy Rybakina is close to an elite-level matchup, with Świątek perhaps having a 45%–60% chance depending on Rybakina’s health and form.

A representative decomposition—approximately 85% to beat Bouzková, 75% to win the round of 16, and 60% to win the quarterfinal—produces a probability near 38%. Her strong current form and Rybakina’s uncertain physical status justify rounding this to 40%, but her inconsistent 2026 season, recent US Open quarterfinal exits, and difficult projected quarter make a probability above 50% too high.

I estimate a 44% probability that Świątek reaches the semifinals, conditional on her having already won the first round. A top-eight seed with her Grand Slam record, 2022 US Open title, and strong recent hard-court form would typically have a meaningful but clearly sub-50% chance of winning the four remaining matches needed for a semifinal berth. The Toronto title, Cincinnati semifinal, efficient opening-round victory, and decision to skip mixed doubles are positive indicators and justify a modest increase from the prior 40% forecast. However, the estimate remains below 50% because she still must navigate three additional rounds before the quarterfinal, likely faces a high-quality opponent in the quarterfinal, has exited at that stage in the last two US Opens, and may face some fatigue after her North American hard-court preparation. The lack of a specific draw and opponent information is the main source of uncertainty.

I estimate a 40% probability that Świątek reaches the 2026 US Open semifinals. She is an elite player with a prior US Open title, a 24–6 reported tournament record, and three consecutive quarterfinal appearances from 2023–2025. Her recent hard-court preparation is encouraging: she reportedly won Toronto and reached the Cincinnati semifinals, and she has already won her opening US Open match without difficulty. Those factors place her above the typical top-10 player baseline. However, reaching the semifinals requires winning several consecutive matches, including a likely quarterfinal against another highly ranked opponent. Her recent US Open record also shows a meaningful quarterfinal obstacle: she has not advanced beyond that round since winning the tournament in 2022. Her No. 8 ranking provides some seeding benefit but does not guarantee an easy draw, and the draw, opponent matchups, fatigue, and injury status remain unknown. Overall, strong current form raises the estimate into roughly the 35–45% range, but the repeated recent quarterfinal exits and normal volatility of a Grand Slam keep it well below 50%.