TOKYO, Japan, October 5, 2026: Carlos Alcaraz spent the first set of his Japan Open semifinal looking vulnerable enough for Jaume Munar to believe an upset was possible.
By the end, the match had become something very different.
The defending champion recovered from losing the opening set to defeat his fellow Spaniard 5-7, 6-3, 6-1 at Ariake Coliseum and reach the Kinoshita Group Japan Open Tennis Championships final for the second consecutive year.
Alcaraz won 12 of the final 16 games. He converted six of 10 break points, collected 41 receiving points and finished with a 95-81 advantage in total points.
The intriguing part is how he did it.
This was not a serving exhibition. Alcaraz won only 39% of his second-serve points, compared with Munar’s 49%. His advantage came from what happened when the first serve landed and from the pressure he created on Munar’s service games.
Alcaraz won 77% of his first-serve points against Munar’s 61%, then repeatedly turned return games into break opportunities.
That combination transformed a match Munar had controlled for long enough to win the first set.
Alcaraz now awaits the winner of Jiri Lehecka and Valentin Vacherot in Tuesday’s final. The official ATP Japan Open tournament page lists the 2026 event in Tokyo from September 30 through October 6.
How Did Carlos Alcaraz Beat Jaume Munar After Losing the First Set?
The scoreline provides the first clue.
Munar won the opening set 7-5.
Alcaraz then won the next two 6-3 and 6-1.
| Statistic | Carlos Alcaraz | Jaume Munar |
|---|---|---|
| Aces | 3 | 2 |
| Double Faults | 4 | 4 |
| First Serve % | 64% | 56% |
| First-Serve Points Won | 77% | 61% |
| Second-Serve Points Won | 39% | 49% |
| Break Points Converted | 6/10 | 3/5 |
| Receiving Points Won | 41 | 34 |
| Total Points Won | 95 | 81 |
| Games Won | 17 | 11 |
| Longest Run of Games | 7 | 4 |
The difference was not simply that Alcaraz started hitting harder.
He began earning more first-strike control behind his first serve while increasing the number of return games in which Munar had to defend break points.
Alcaraz eventually broke six times.
Munar broke three.
That three-break differential almost exactly describes the six-game difference in the final match score.
Why Was Alcaraz’s First Serve More Important Than His Second?
One number should prevent anyone from describing this as a complete serving performance.
Alcaraz won just 39% of his second-serve points.
Munar actually did better in that category at 49%.
Yet Alcaraz’s first serve created a much larger advantage.
He landed 64% of first serves and won 77% of those points. Munar put only 56% of his first serves in play and won 61% behind them.
The gap matters because it gave Alcaraz more routine service points and more freedom to attack once he began reading Munar’s delivery better.
CARLOS ALCARAZ INTO THE TOKYO FINAL FOR THE SECOND YEAR IN A ROW AND HIS FIRST FINAL AFTER MISSING 5 MONTHS DUE TO INJURY https://t.co/BAS28CLLHd
— f #7inMelbourne (@fvaeey) October 5, 2026
His overall service numbers remain especially interesting because Alcaraz arrived in Tokyo working with a modified service motion. TSE examined those early adjustments after his difficult opening-round victory in our Japan Open Round of 32 report.
Against Alex Michelsen, Alcaraz had needed three sets to survive while the serve remained an obvious work in progress.
The semifinal suggests the adjustment is still incomplete, but Alcaraz is finding ways to prevent the weakness from controlling the whole match.
Where Did the Semifinal Turn?
Munar’s first-set victory mattered because it confirmed this was not going to become a routine favorite-versus-qualifier match.
He had already earned his place in the semifinal by beating Taylor Fritz in the opening round, Jaime Faria in the Round of 16 and Kyrian Jacquet in the quarterfinal.
Munar therefore entered the match with evidence that he could beat higher-profile opponents in Tokyo.
For a set, that belief was visible.
The problem arrived when Alcaraz began sustaining pressure instead of producing it in isolated bursts.
The match statistics show Alcaraz’s longest run reached seven consecutive games. Munar’s longest run was four.
That is a revealing distinction.
Munar was able to create momentum.
Alcaraz eventually turned momentum into separation.
Once the second set moved in the defending champion’s direction, Munar had increasingly little room to recover between return pressure and Alcaraz’s improved first-serve effectiveness.
How Did Alcaraz Win Despite Munar’s Better Second-Serve Numbers?
This is the most useful statistical lesson from the semifinal.
Munar won a higher percentage of second-serve points.
Alcaraz still won 14 more points overall.
The explanation sits in three areas:
- First-serve effectiveness: Alcaraz won 77% compared with Munar’s 61%.
- Return pressure: Alcaraz won 41 receiving points compared with Munar’s 34.
- Break opportunities: Alcaraz created 10 break chances and converted six.
That meant Munar’s second-serve advantage never became large enough to offset what Alcaraz was taking from the rest of the match.
Alcaraz finished with 54 service points won to Munar’s 47 and 11 service games won to Munar’s eight.
It was therefore less a story of one overwhelming weapon than a match gradually being tilted in several smaller areas.
Why Does This Final Matter More Than Another ATP 500 Result?
Alcaraz’s Tokyo title defense sits inside a much larger 2026 story.
He began the year by winning the Australian Open and completing the Career Grand Slam. The ATP later confirmed his return to Tokyo as defending champion after he had won the tournament on debut in 2025.
His season was then interrupted by a wrist injury that kept him away from singles competition for more than four months.
TSE examined that uncertainty before his return in our analysis of Alcaraz’s US Open comeback.
His New York return provided encouraging evidence almost immediately. TSE’s US Open men’s tournament report followed the improvement as he reached the second week, while our quarterfinal-race analysis showed how the original fitness question had gradually become less important than his tennis.
Ben Shelton eventually stopped Alcaraz in a five-set US Open quarterfinal that finished at 3:33 a.m., a match examined in TSE’s report on Shelton’s breakthrough victory.
Tokyo now offers a different measurement.
Alcaraz is no longer merely proving that he can survive matches after injury.
He is one victory from successfully defending a title.
His official ATP player profile documents a career that has already included the No. 1 ranking and multiple major titles, but this particular final carries significance because of the interrupted season that preceded it.
What Did Jaume Munar Prove in Tokyo?
The 6-1 deciding set should not erase Munar’s tournament.
He came through qualifying and then removed third seed Taylor Fritz in three sets in the opening round.
He followed that by beating Jaime Faria 6-1, 6-1 and Kyrian Jacquet 6-4, 6-2.
Against Alcaraz, he became the first player in this semifinal to establish scoreboard control and took the opening set from the defending champion.
The official ATP biography of Jaume Munar shows that he had previously beaten Alcaraz in Marbella in 2021 and has built much of his career around making favored opponents play uncomfortable matches.
Tokyo reinforced that identity.
The semifinal also showed its limit.
Munar could trouble Alcaraz.
He could not sustain the same level once the match became more physical, more return-heavy and more demanding over successive service games.
How Has Alcaraz Rebuilt Momentum Since the US Open?
Tokyo is not occurring in isolation.
After New York, Alcaraz joined Team Europe at the Laver Cup in London.
TSE’s Laver Cup preview examined how his reduced match volume affected Europe’s plans.
He then contributed to Europe’s opening-day lead in doubles, covered in our Day 1 report.
The most important performance came later against Taylor Fritz.
Alcaraz saved two match points and won the Laver Breaker 13-11, a result that helped reverse Europe’s deficit before the team eventually won the event 13-5. TSE analyzed that turnaround in our Laver Cup final report.
Tokyo has continued the pattern.
His opening match required three sets.
Matteo Arnaldi forced him to save four set points before Alcaraz advanced 7-6(6), 6-1.
Denis Shapovalov then retired during their quarterfinal with Alcaraz leading 7-6(3), 2-1.
Munar presented another kind of test by taking the opening set.
Alcaraz has now survived all of them.
Who Will Carlos Alcaraz Play in the Japan Open Final?
Alcaraz will face the winner of the second semifinal between Jiri Lehecka and Valentin Vacherot.
Lehecka reached the last four after defeating qualifier Daniel Vallejo 6-1, 6-1.
Vacherot advanced through a much tighter quarterfinal, beating Arthur Fils 7-5, 4-6, 6-4.
The final is scheduled for Tuesday, October 6.
Whoever comes through the second semifinal will face a defending champion who has not played his cleanest tennis throughout the week but has repeatedly found another level when matches have become dangerous.
What Should Alcaraz Fix Before the Final?
The second serve is the obvious starting point.
A 39% success rate on second-serve points creates unnecessary vulnerability against a player capable of attacking the return more aggressively than Munar did.
Four double faults also show there is still volatility in the service motion.
The encouraging counterpoint is that Alcaraz’s first serve held up extremely well and his return game became progressively stronger.
If the first-serve percentage remains around the mid-60s while the second-serve numbers improve, the final becomes significantly harder for either Lehecka or Vacherot.
The larger lesson from the semifinal is therefore fairly clear.
Alcaraz did not need his entire game to function perfectly.
He needed enough parts of it to improve before Munar could finish the upset.
They did.
Japan Open 2026 Alcaraz vs Munar FAQs
Who Won the Carlos Alcaraz vs Jaume Munar Semifinal?
Carlos Alcaraz defeated Jaume Munar 5-7, 6-3, 6-1.
Did Alcaraz Lose the First Set?
Yes. Munar won the opening set 7-5 before Alcaraz recovered to win the next two sets.
How Many Break Points Did Alcaraz Convert?
Alcaraz converted six of 10 break-point opportunities. Munar converted three of five.
How Many Total Points Did Alcaraz Win?
Alcaraz won 95 points compared with Munar’s 81.
What Was Alcaraz’s First-Serve Win Percentage?
Alcaraz won 77% of points behind his first serve.
Why Was Alcaraz’s Second Serve a Concern?
He won only 39% of second-serve points, below Munar’s 49%, making that one of the clearest areas to improve before the final.
How Many Consecutive Games Did Alcaraz Win?
His longest run during the match was seven consecutive games.
Who Will Alcaraz Play in the Japan Open Final?
He will face the winner of Jiri Lehecka versus Valentin Vacherot.
When Is the Japan Open Final?
The men’s singles final is scheduled for Tuesday, October 6, 2026.