Paul is Alcaraz's first real test since his comeback
Carlos Alcaraz and Tommy Paul meet again today in the round of 16 at the US Open, about seven and a half months after Melbourne, with the same imbalance in their head-to-head: 6-2 for the Spaniard, five consecutive wins. The variable deciding this round of 16 is leg stamina, and it cuts both ways. Paul arrives having played 125 games in three rounds. Alcaraz has played 89, and that's nearly every game he's played since mid-April. The comeback has asked nothing of him so far: three matches, ten sets, none over two hours and forty minutes. Paul is the first opponent in New York who can take him past that mark, as he already did in Melbourne, and that is what makes this round of 16 the first real test since the layoff.
The workload: 125 games to 89, with the same day of rest
Paul beat Alexander Bublik 6-4, 3-6, 6-7(4), 6-1, 6-3, after eliminating Dino Prizmic in four sets and just over three hours in the previous round. Thirteen sets in three matches. Alcaraz has played ten, for a total of seven hours and twenty-one minutes on court, never going over two hours and forty minutes in a single match.
The rest is identical: both played on Friday and return today. What separates the two is accumulated mileage, and it only shows if the third set runs long.
One number complicates the lazy fatigue narrative. Paul closed out Bublik 6-1, 6-3, breaking him four times in a row. A player who finishes a five-setter like that doesn't arrive at the next round in pieces.
The opposite unknown: Alcaraz hasn't played a long match since April
Alcaraz returned in New York after tenosynovitis in his right wrist kept him out for over four months, with withdrawals from Madrid, Rome, Roland Garros, Queen's, Wimbledon, Toronto and Cincinnati. Three matches won, a streak of 17 straight wins at Majors, no match over two hours and forty minutes.
Against Wu Yibing he won 6-3, 6-4, 6-1, with most of his unforced errors coming on the forehand side. It's the shot that loads the right wrist the most, and it's the shot costing him the most errors. Over three sets the tally doesn't matter, because the match never reaches the point where that margin is needed. Over four sets, against a player who gets everything back and stretches out the rallies, it matters.
Melbourne, January: where Paul loses these matches
In the round of 16 at the 2026 Australian Open, Paul lost 7-6(6), 6-4, 7-5 in about two hours and forty-five minutes. He played three sets in which he stayed in contention until the last game and won none of them.
The pattern has repeated over five matches. Paul gets into the rally, holds his level, and gives up the two or three points that decide the set. His problem against Alcaraz isn't the game plan, it's conversion in the big games.
Even winning a set isn't enough on its own. At Wimbledon 2024 Paul took the first 7-5 and then lost the next three 6-4, 6-2, 6-2. What he needs is to keep the pace high for more than two and a half hours, that is, to drag Alcaraz into a zone of the match the Spaniard hasn't visited since April.
The prediction, and what disproves it
Alcaraz starts as the clear favorite, and the window where that favor is strongest is the first two sets: in that stretch his serve-plus-forehand combination closes out rallies before pace and wrist become an issue. If the match stays under two and a half hours, it ends in three.
The condition that flips it is a fourth set. Worth watching in the first set is Alcaraz's forehand unforced error count: above ten in a set, the margin narrows and the 125 games in Paul's legs count for less than his lack of long matches.
