2023: Maiden ITF title In May, at the age of 16, Engel became the youngest German men's title winner since 2003 when he won an
ITF World Tennis Tour tournament in Villach, Austria.
2024: ATP Tour debut In July, Engel made his
Challenger main draw debut at the
Tennis Open Karlsruhe, having received a wildcard. He defeated world No. 138 and five-time major doubles champion
Pierre-Hugues Herbert in the first round to claim his first Challenger main draw win and first top-150 win. In October, at the age of 17, Engel made his
ATP Tour main draw debut at the
Almaty Open after receiving a main draw wildcard. He defeated
Coleman Wong in straight sets to claim his first ATP Tour main draw win, becoming the youngest player to do so since
Carlos Alcaraz at the
2020 Rio Open and the first player born in the year 2007 to win an ATP match.
2025: ATP quarterfinal, Challenger title, top 200 In May, at the
2025 Hamburg Open where he entered the main draw as wildcard, Engel defeated compatriot
Jan-Lennard Struff to record only his second ATP Tour level win. In June, at 17 years and eight months, at the
2025 BOSS Open, Engel became only the second-youngest player since 1990 to win a tour-level match (excluding Davis Cup) on three surfaces: hardcourt, clay court and grass after
Rafael Nadal who accomplished the feat at a younger age (at 17 years and two months). It was his first professional win on grass courts. He reached his first quarterfinal on the
ATP Tour by defeating seventh seed
Alex Michelsen in the second round, his first win over a top 50 player. He became the youngest quarterfinalist in the history of the tournament and the youngest at a grass tournament since
Boris Becker at Wimbledon in 1985. He lost to fourth seed
Félix Auger-Aliassime in the quarterfinals. In September, Engel became the second youngest player in the
Germany Davis Cup team after
Boris Becker when he beat Japanese
Rei Sakamoto in his debut match. He reached his first semifinal at a
Challenger 125 at the
Orléans Open, losing to top seed
Raphaël Collignon in the semifinal. As a result Engel entered the top 200 at world No. 191 on 29 September 2025, putting him at 10th position in the
NextGen race to Jeddah. In October, at 18 years and 25 days, Engel won his maiden
Challenger title at the
2025 Hamburg Ladies & Gents Cup, defeating 18 year-old
Federico Cinà, in the youngest Challenger final since Ancic-Nadal in 2003. Engel overtook Fonseca as the youngest Challenger winner of 2025, and was the fifth-youngest German champion in Challenger history. As a result he reached a new career-high ranking of No. 188 on 27 October 2025, and also moved into ninth position in the NextGen ATP race. ==Performance timeline==