By Cole Gallagher / September 8, 2026
US Open 2026 · Men’s Singles Quarter-Final · Wednesday, September 9 · USTA Billie Jean King National Tennis Center, Flushing Meadows, Queens, NY · Hard Court
🎾 Karen Khachanov vs Alexander Blockx 🎾
Court and session are set by the daily order of play. Expect one of the two main show courts.
Canadian readers have a reason to watch this one that has nothing to do with the betting. Karen Khachanov is the man who ended Felix Auger-Aliassime’s US Open in the second round, and he has since gone on the deepest run of his week to reach a quarter-final nobody had him in. Across the net is Alexander Blockx, a 21-year-old Belgian in his first Grand Slam quarter-final who has just told reporters he is worried about his body. Compare the books before you back either side in our top betting sites guide.
Odds Comparison
| Sportsbook | Khachanov | Blockx |
| Sports Interaction | Check Odds → | Check Odds → |
| Betovo | Check Odds → | Check Odds → |
| Bet365 | Check Odds → | Check Odds → |
| Tonybet | Check Odds → | Check Odds → |
| Betway | Check Odds → | Check Odds → |
Total Games (Over/Under)
Set Betting (Correct Score in Sets)
Player Analysis
Karen Khachanov
Ranked No. 50 and unseeded, the 30-year-old Russian has quietly assembled the best fortnight of anyone in the bottom half of the top quarter. The result that will be remembered in this country is his second round: he beat the third seed Felix Auger-Aliassime 6-7(5), 6-3, 6-2, 6-2, a match in which the Canadian said afterwards that he was “dizzy and seeing spots” and could not recover. It was Khachanov’s first win over a top-ten player at Grand Slam level since June 2019. Our Canadians at the US Open 2026 hub has the full account of how that afternoon unravelled.
He has kept going since. Benjamin Bonzi went in straight sets, and the fourth round against the 14th seed Learner Tien was a proper five-set fight: 7-5, 4-6, 6-7(6), 6-1, 6-4, won from two sets to one down against a 20-year-old in front of a home crowd. That is his second US Open quarter-final and his first major quarter-final since Wimbledon last year. He is a big, heavy hitter with a serve that holds up under pressure, and the two comeback wins tell you his conditioning is not a problem.
Key Storyline: Beat the third seed and then came from two sets to one down to win a five-setter against the 14th seed
Alexander Blockx
Blockx is the story of the men’s draw. The 21-year-old is the first Belgian man ever to reach the US Open quarter-finals, and he has done it on his debut in New York. His 2026 already included a Madrid semi-final in May and a first ATP final at Estoril in July. Here he beat the fifth seed Flavio Cobolli 6-7(4), 6-3, 6-0, 6-3 in the third round and then the 24th seed Francisco Cerundolo 6-3, 4-6, 7-5, 7-5 in the fourth. Two seeded scalps in two matches, and a bagel set against a top-five seed in the middle of it.
The honest caveat is one he has raised himself. He struggled physically during that fourth-round win and has since said publicly that he is “a bit worried” about whether he will be right for this quarter-final. That is his own assessment rather than a diagnosis, and until he walks on court it is unresolved — but it is the single biggest variable in this match and anyone betting it before the warm-up is guessing at his condition.
Key Storyline: First Belgian man in a US Open quarter-final, having beaten the fifth and 24th seeds — but has questioned his own fitness
Key Betting Angles
There is no head-to-head. These two have never met on the main tour, so there is nothing to lean on and nothing to invent. The matchup has to be read on profiles: Khachanov is the bigger, more experienced ball-striker with the better serve and a decade of second-week Grand Slam tennis behind him; Blockx is the quicker, more inventive player with far less mileage in his body but far less experience of what a Grand Slam quarter-final asks of you.
That experience gap is the reason Khachanov should be favoured. It is also worth noting that he has been in this exact position before and lost — a quarter-final is not new territory for him, but neither is falling at this stage. Blockx has beaten two seeds in a row, and a 21-year-old on this kind of run does not usually run out of belief.
The fitness question makes the outright market unattractive at short odds and pushes the value towards the games and set markets. If Blockx is physically compromised, the under on total games and a straight-sets Khachanov win become the live positions. If he is fine, this is a four-set match with tiebreaks in it. Waiting for the first two service games before committing is legitimate here.
Our Prediction
Cole’s Pick: Karen Khachanov to win in four sets
Khachanov has beaten a top-three seed and a top-15 seed in this tournament, he has come from behind in a five-setter, and he is the only man in this match who has played a Grand Slam quarter-final before. Back him. The four-set line is where we would sit rather than straights, because Blockx has taken a set off every seed he has faced and because a young player in his first major quarter-final usually gets one good set out of the occasion even on a bad day. Keep the stake modest until the fitness picture is clear.
Confidence: medium on the match winner, medium-low on the exact scoreline given the fitness uncertainty
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Cole Gallagher covers soccer betting for WorldCupBetting.ca, specialising in match predictions, odds analysis and tournament futures. Based in Toronto, he has followed the Canadian men’s national team since their 2022 qualifying campaign and brings a line-shopping, data-first approach to every pick.