Karen Khachanov and Alexander Blockx meet in the US Open round of 16 on September 9 at 2:30 PM ET, and this Karen Khachanov vs Alexander Blockx prediction lands on Khachanov's side of the draw. The market has him at -147. T Money's read favors him too, on the strength of a small hold rate edge and a return game built to attack Blockx's biggest weakness. But the tier here is PASS. No official action, no unit on the board. Here's the case for Khachanov, the case against him, and why the number didn't clear the bar to bet.
Both men arrive banged up in different ways. Khachanov played a four match, 15 set stretch in 14 days that ended with a five set win over Learner Tien on September 7. Blockx played five matches and 17 sets in the same window, including doubles, and left his round of 16 win over Francisco Cerundolo with sharp rib pain that nearly forced a retirement. That single fact reshapes everything below it.
Why T Money leans Khachanov
Strip out the surface noise and this comes down to two hard court numbers. Over the last 12 months, Khachanov holds serve at 87% and breaks at 19%, against Blockx's 84% hold and 19% break. Small gap, but it lines up with the shape of this matchup: Khachanov's second serve has held up well enough to protect those service games, and his second serve return has historically applied pressure right where Blockx is thin.
That thin spot is real and it's recent. In Blockx's rib-affected round of 16 against Cerundolo, his second serve win rate fell to 47.5%, part of a broader three month stretch where his second serve success sits at 45.3% with a 6.1% double fault rate. Double faults have been Blockx's recurring leak all tournament, seven of them against Marco Trungelliti, seven more against Cerundolo. Khachanov's game plan writes itself: make Blockx play second serve points, and make him pay for the faults when they come.
The case against
Khachanov's own form isn't clean, either. His first serve percentage has slid from roughly 66% over the longer windows down to 54% in the past month, and his win over Felix Auger-Aliassime came in a match Auger-Aliassime didn't finish healthy, reporting dizziness and visual disturbance from roughly the halfway point on. That result props up Khachanov's tournament line but it's a softer form data point than the scoreline suggests.
Blockx, meanwhile, has beaten better players. His win over Flavio Cobolli, a Roland Garros finalist, and his win over Cerundolo, fresh off back to back five set matches including one against Taylor Fritz, are both quality wins against ranked-above opposition. His first serve was the difference in both, and his first serve return has been the more dangerous shot of the two players' return games all tournament. If the rib injury doesn't limit his service motion on September 9, that first strike ability is the path that beats Khachanov, by pressuring the exact first serve percentage that's already trending the wrong way.
The number that matters
The rib injury is the swing fact, and it's also the fact nobody can currently measure. Blockx nearly retired mid-match against Cerundolo, played through it with medication, and there's no verified word yet on how his serve motion looks two days later against a healthier opponent. A first strike game built around the serve doesn't survive a compromised rib cage. But T Money doesn't have a clean read on how compromised he actually is walking into Wednesday.
That's the whole reason this stays a PASS. The hold rate and return numbers give Khachanov a real, if modest, structural edge, and that's enough to name him as the side we'd lean if we were forced to pick a winner. It is not enough, on its own, to clear the gap needed to make -147 a number worth staking money on once an unresolved injury variable this large sits on the other side of the court. When the health question is this open, guessing at how much it moves the number isn't handicapping, it's noise. So the pick stands, the bet doesn't.
The verdict
Khachanov is T Money's side in this Karen Khachanov vs Alexander Blockx prediction, built on the hold rate edge and a return game that targets Blockx's double fault problem. But this is an official PASS: no play, no unit, no action at -147. Blockx's rib injury is too fresh and too unverified to trust the number that price is built on, and a pick without a trustworthy number doesn't get backed here regardless of which side it favors.