Francisco Cerundolo vs Alexander Blockx: US Open 2026 Round of 16 Preview

The US Open 2026 men's singles draw features a compelling battle between experience and breakthrough momentum as Francisco Cerundolo takes on Alexander Blockx in the Round of 16.

Cerundolo arrives in the fourth round after one of the most dramatic victories of the tournament, while Blockx has produced a stunning run in his first US Open main draw. Both players now have a major opportunity to reach the quarterfinals in New York.

Francisco Cerundolo's Road to the Round of 16

Cerundolo entered the US Open as the No. 24 seed and arrived in New York with plenty of experience on the Grand Slam stage. The Argentine had already reached the fourth round at both the Australian Open and Roland Garros before this tournament.

His path to the second week in New York, however, required a remarkable comeback. Cerundolo faced No. 9 seed Taylor Fritz in the third round and dropped the opening two sets.

The Argentine refused to go away, changing the momentum of the contest before eventually defeating the American 3-6, 4-6, 6-3, 6-4, 6-4.

Who Is Alexander Blockx?

Alexander Blockx is one of the most exciting young players to emerge from Belgium. The 21-year-old former junior world No. 1 arrived at the US Open having already made significant progress during his first full season at the Grand Slam level.

Blockx made his men's singles main-draw debut at all four Grand Slam tournaments in 2026. Before New York, his best major result had been reaching the second round at Roland Garros.

He has now gone well beyond that mark and is playing the biggest tennis of his young career.

Blockx's Breakthrough Run in New York

Blockx entered the tournament as the No. 28 seed but quickly demonstrated that his seeding was no indication of his potential.

His biggest victory came in the third round against No. 5 seed Flavio Cobolli. Blockx recovered from losing a tight opening set before taking control of the match and winning 6-7(4), 6-3, 6-0, 6-3.

The Belgian was particularly impressive in the third set, winning 24 of 28 points as he completely turned the match around. He also struck 17 aces and 41 winners during the victory.

Cerundolo vs Blockx: A Previous Meeting

The two players have already faced each other once, making this matchup even more interesting.

Their first meeting came at the Madrid Open in May. Blockx produced an impressive performance to defeat Cerundolo 7-6(8), 6-2 on clay.

Blockx therefore enters the US Open match with the confidence of already having beaten Cerundolo, although the conditions in New York are very different from those in Madrid.

Cerundolo will also be motivated by the opportunity to reverse that result on one of the biggest courts in tennis.

Why Cerundolo Is Dangerous on Hard Courts

Cerundolo is an aggressive baseliner who can generate significant pace from both wings. His forehand is particularly effective when he is able to take control of rallies and move opponents around the court.

His victory over Fritz demonstrated another important quality: resilience. After losing the opening two sets, Cerundolo stayed composed and gradually forced his way back into the contest.

That experience could become valuable if the match against Blockx develops into another long battle.

Why Blockx Can Trouble Cerundolo

Blockx has already demonstrated that he can compete with highly ranked opponents. His victory over Cobolli was not simply an upset; it was a performance built around aggressive serving, powerful groundstrokes and the ability to maintain intensity throughout the match.

His 17 aces against Cobolli show how much pressure he can create with his serve. If he continues to win a high percentage of first-serve points, Cerundolo could struggle to create consistent opportunities.

Blockx's confidence should also be high after reaching the second week of a Grand Slam for the first time.

The Key Battle: Experience vs Momentum

Cerundolo has the advantage in experience. He has already played multiple Grand Slam fourth rounds and knows what it takes to handle the pressure of the second week.

Blockx, however, has the momentum. The Belgian has already defeated a top-five seed and has nothing to lose heading into Arthur Ashe Stadium.

That contrast could make the match particularly unpredictable. Cerundolo will want to make the contest physical and force Blockx to construct points patiently, while Blockx will look to use his serve and aggressive first strikes to keep rallies short.

What Is at Stake?

The winner will advance to the US Open quarterfinals, which would represent a major milestone for both players.

For Cerundolo, another victory would give him a chance to reach his first US Open quarterfinal and continue an impressive season at the Grand Slams.

For Blockx, a win would take him into his first Grand Slam quarterfinal at just 21 years old and make his breakthrough tournament even more remarkable.

The winner will also move into a potential quarterfinal against either Alexander Zverev or Luciano Darderi.

Francisco Cerundolo vs Alexander Blockx: Match Prediction

Cerundolo's experience and recent comeback against Fritz give him an important advantage, but Blockx has already shown that he can defeat higher-ranked opposition.

The Belgian's serve could be the deciding factor if he maintains the level he showed against Cobolli. Cerundolo, meanwhile, will need to make Blockx work through long baseline exchanges and test the younger player's consistency.

Blockx has already beaten Cerundolo once this season, but Cerundolo now has the benefit of playing on hard court and arrives with considerable momentum of his own.

This should be a competitive contest, with Cerundolo's Grand Slam experience giving him a narrow edge. Blockx's confidence and aggressive game, however, make another upset a very realistic possibility.