Alexander Blockx US Open Run Ends in Quarter-Finals (Alexander Blockx) after the Belgian retired against Karen Khachanov in the 2026 men’s singles quarter-final. Khachanov led 6-2, 7-5, 3-2 when Blockx was unable to continue at Arthur Ashe Stadium, ending a remarkable first main-draw campaign in New York.
The result was painful for the 21-year-old, but it should not obscure the scale of his achievement. Blockx became the first Belgian man to reach the US Open singles quarter-finals and the youngest Belgian man to make a Grand Slam quarter-final in the Open Era. US Open
Alexander Blockx vs Karen Khachanov: Quarter-Final Result
| Match | Result |
|---|---|
| Tournament | 2026 US Open, men’s singles |
| Round | Quarter-finals |
| Venue | Arthur Ashe Stadium, New York |
| Winner | Karen Khachanov |
| Score | 6-2, 7-5, 3-2 retired |
| Blockx’s status | Retired in the third set due to physical issues |
Khachanov progressed to the semi-finals, but the match never became the free-flowing contest many expected after Blockx’s impressive run through the draw. The Belgian was visibly managing discomfort from the opening stages and required medical attention during the match.
A Difficult End to a Memorable Tournament
Blockx had already indicated that his body was under strain before the quarter-final. During his fourth-round victory over Francisco Cerundolo, he experienced sharp pain around his right ribcage and came close to retiring. Against Khachanov, he arrived with his left thigh heavily bandaged and later received treatment for his right foot, hip and back.
The physical issues compounded as the match developed. Blockx explained that he was still feeling the rib problem and had also aggravated a nerve in his back, which affected his movement. Rather than speculate on a diagnosis or recovery timeline, the important point is that no official medical prognosis had been announced at the time of the retirement.
He continued to compete through two sets, but Khachanov’s solid serving and consistent depth made the task increasingly difficult. When the Russian broke to lead 3-2 in the third set, Blockx made the decision to stop. The official US Open report recorded the Belgian’s assessment plainly: his body had “gave up.”
For a young player in his first US Open main draw, it was an unfortunate lesson in the physical demands of best-of-five-set Grand Slam tennis.
How Khachanov Took Control
Khachanov did not simply benefit from the retirement; he had established a meaningful lead before the match ended. He broke Blockx twice in the opening set and won it 6-2, taking advantage of a reduced first serve and shorter movement from the Belgian.
The second set was more competitive. Blockx held his ground for long stretches and showed the composure that had carried him through the first week. However, Khachanov’s serving remained a decisive advantage. He broke late in the set and closed it 7-5, leaving Blockx two sets down.
By the third set, Blockx was battling both the scoreline and his physical condition. Khachanov’s ability to keep rallies firm and controlled limited the opportunities for the Belgian to play the aggressive baseline tennis that had defined his earlier victories.
The official match result remains a retirement, but it also reflects a disciplined performance from Khachanov, who had done enough to put himself within reach of the semi-finals.
The Run That Changed Blockx’s Profile
The retirement should be viewed in the context of what came before it. Blockx arrived in New York as the 28th seed and had never previously played a US Open main-draw match. He left having produced his deepest run at a Grand Slam.
His fourth-round victory over 24th seed Francisco Cerundolo was the defining result of the campaign. Blockx won 6-3, 4-6, 7-5, 7-5 in his first match on Arthur Ashe Stadium, handling a difficult opponent and a major occasion with unusual maturity.
| Round | Opponent | Result |
|---|---|---|
| First round | Tomás Barrios Vera | Won 6-3, 6-4, 6-2 |
| Second round | Marco Trungelliti | Won 6-3, 6-2, 3-6, 6-1 |
| Third round | Flavio Cobolli | Won 6-7(4), 6-3, 6-0, 6-3 |
| Fourth round | Francisco Cerundolo | Won 6-3, 4-6, 7-5, 7-5 |
| Quarter-final | Karen Khachanov | Lost 2-6, 5-7, 2-3 retired |
The Cerundolo win was especially significant. It made Blockx the first Belgian man to reach the US Open quarter-finals, a milestone in a country with a strong tennis history but limited men’s success at Flushing Meadows.
Why This US Open Still Counts as a Major Success
A retirement in a Grand Slam quarter-final can make a result feel unfinished, particularly when a player has fought through four demanding rounds. Yet Blockx’s US Open campaign remains an important breakthrough for several reasons.
First, he proved that his game can hold up against seeded players in best-of-five tennis. His wins over Cobolli and Cerundolo were not isolated upsets; they showed he could recover after losing sets, sustain intensity and close under pressure.
Second, he gained experience on the sport’s biggest stage. Winning in Arthur Ashe Stadium before reaching the quarter-finals is valuable exposure for any emerging player. Blockx had previously been a successful junior, including winning the 2023 Australian Open boys’ singles title, but the US Open run offered a different level of scrutiny and challenge.
Third, the run confirms the progress of his 2026 season. Earlier in the year, Blockx made a strong ATP Masters 1000 run in Madrid and continued to move upward after beginning the season outside the world’s top 100. The US Open’s pre-quarter-final profile noted his rapid rise and his ambition to keep improving physically and tactically.
What Indian Tennis Fans Should Take From It
For Indian viewers following the next generation of men’s tennis, Blockx is a name worth remembering. He combines a 6ft 4in frame with surprisingly quick court coverage, and his baseline game can shift rapidly from patient construction to attacking shot-making.
His New York results also offer a reminder that major tournaments test recovery as much as talent. Four rounds of best-of-five tennis can expose small physical issues, especially for a player making a first deep Grand Slam run. The next phase of Blockx’s development will be about turning this experience into sustained success across a full season.
That does not require him to become a finished product immediately. At 21, reaching a US Open quarter-final is evidence of a high ceiling, not a demand for instant titles.
What Happens Next for Alexander Blockx?
The immediate priority is recovery and a clear medical assessment. It would be premature to make assumptions about his next tournament or fitness timeline until he and his team provide an update.
On court, the US Open has given Blockx valuable ranking points, greater visibility and proof that he can compete deep into major draws. His challenge will be managing expectations while improving the physical durability required for repeated Grand Slam runs.
Khachanov moves on to the semi-finals, while Blockx leaves New York with a mixture of disappointment and confidence. The quarter-final ended early, but his tournament established him as one of Belgium’s most promising current players.
FAQs
Why did Alexander Blockx retire from the US Open quarter-final?
Blockx retired because of multiple physical problems during the match, including pain around his rib area and issues affecting his foot, hip and back. He was trailing Khachanov 6-2, 7-5, 3-2 at the time.
Who beat Alexander Blockx at the 2026 US Open?
Karen Khachanov advanced after Blockx retired in their men’s singles quarter-final.
What was the score when Alexander Blockx retired?
Khachanov led 6-2, 7-5, 3-2 when Blockx retired in the third set.
Was this Alexander Blockx’s best Grand Slam result?
Yes. The US Open quarter-final was Blockx’s deepest run at a Grand Slam tournament at that point.
What record did Blockx set at the US Open?
He became the first Belgian man to reach the US Open singles quarter-finals and the youngest Belgian man to reach a Grand Slam quarter-final in the Open Era.
Did Alexander Blockx defeat Francisco Cerundolo at the US Open?
Yes. Blockx beat Cerundolo 6-3, 4-6, 7-5, 7-5 in the fourth round to reach the quarter-finals.
