From teenage breakthroughs to the reigning NCAA champion taking the professional stage and a historic title run in Africa, ATPtour.com recaps the storylines of five Challenger players from the 2025 season.
German teenager Engel ends up as the youngest champion of 2025
Fans in Hamburg witnessed the rise of a new German star as Justin Engel stormed to his first ATP Challenger title on home soil.
At 18 years and 25 days, Engel became the season’s youngest Challenger champion and the fifth-youngest German winner in history. The #NextGenATP teenager defeated fellow 18-year-old Federico Cina 7-5, 7-6(4) in the final – the youngest championship match at that level since 2003, when Mario Ancic defeated Rafael Nadal, also in Hamburg. Engel became the first player born in 2007 to win an ATP Challenger event.
“Every title is big, especially my first Challenger,” Engel said at the time. “Cina is a big player and I knew before the match that it would be a tough match. This win makes it even better and I am very happy.”
Zheng goes from NCAA champion to three-time Challenger titlist
College tennis players continue to excel on the Challenger circuit, including Michael Zheng, who won the 2024 NCAA singles title representing Columbia University and successfully defended his title last month.
Thanks to his collegiate success, Zheng qualified for the ATP Next Gen Accelerator, a program that aims to increase the development pathway for top players in the U.S. collegiate system to earn direct entry into select Challenger events. Zheng made the most of one of his Accelerator spots at the Chicago Challenger in August, reaching the winner’s circle as world No. 416. Zheng then extended his title win in September with back-to-back trophies in Columbus and Tiburon.
“It’s definitely a super helpful program,” the 21-year-old said of the Accelerator program. “It gives a lot of incentive for players to go to college and follow that path. You just get a flying start in your career… You have a good result, just like I did in Chicago, and then suddenly your ranking is there to get into the main draw of Challengers yourself. I think it’s a great initiative.”
Michael Zheng is crowned champion of the Tiburon Challenger. Credit: Natalie Kim
Coulibaly’s historic title in Ivory Coast
You can’t imagine Elakim Coulabily’s first Challenger title better. His home country, Ivory Coast, hosted consecutive tournaments and became the 95th country to host an ATP Challenger event. It was there in the capital Abidjan where Coulibaly achieved contrasting results and ended with one of the most memorable moments of his career.
After an opening round loss in the first week, Coulibaly spun freely and gave his home fans plenty to cheer about. The Ivorian closed the title series with a final victory in three sets and fell on his back in relief as the locals rose to their feet. Coulibaly became the first player from Ivory Coast to win a Challenger title.
Reflecting on his full-circle journey, Coulibaly said: “Never stop believing, man. Never stop believing. I come from the fire. I come from Africa. Being an African person and trying to make it on the ATP Tour is hard. You don’t see many African players trying to play because it’s hard. But for me, it’s just discipline and never stop believing. It’s a tough journey for me.”
#NextGenATP Budkov Kjaer ends historic season and joins Gasquet, Rune and Coria in record books
Remember the name Nicolai Budkov Kjaer. The 19-year-old, who will compete in the Next Gen ATP Finals presented by PIF this month, was one of six players to capture four Challenger titles as the season led. The Norwegian became the fourth youngest player to accomplish the feat, joining an elite trio of Richard Gasquet, Holger Rune and Guillermo Coria, all of whom spent time in the Top 10 of the PIF ATP Rankings.
“You always want to believe that you have the level to beat the guys at the top and I have always believed that I am a very dangerous opponent,” said Budkov Kjaer after winning his first Challenger title in Glasgow in February. He was also crowned champion in Tampere, Astana and Mouilleron le Captif.
Fonseca, Del Potro side by side in history
On a meteoric rise over the past twelve months since winning the Next Gen ATP Finals presented by PIF, Joao Fonseca made history in his ATP Challenger performances. Just 13 days removed from his victory in Jeddah, the Brazilian won the Canberra Challenger, joining Jannik Sinner as the only players to win their subsequent tournament after claiming the 20 and under event.
Then, at the ATP Challenger 175 event in Phoenix in March, Fonseca won his third trophy at that level, becoming the second-youngest player from South America – after Juan Martin del Potro – to achieve the feat. Fonseca, who also won the ATP 250 in Buenos Aires and the ATP 500 in Basel, also became the fourth youngest player to win an ATP Tour event and an ATP Challenger tournament in the same season. He ranks alongside Kei Nishikori and three ATP No. 1 Club members; Carlos Alcaraz, Andy Roddick and Lleyton Hewitt are the five youngest players to achieve this feat.
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