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Before Nebraska
Dullinger is one of Germany's top juniors. In June 2025, he was ranked No. 12 in Germany (U18) and No. 121 in the men's singles rankings, with a UTR of 12.03.
The class of 2025 graduate has competed in many international tournaments since 2022. His junior career is highlighted by two singles title wins. In 2023 he won the J30 Leiman, and in 2024 he won the J60 Singapore. In January 2025, he reached his career-high ITF ranking of 280 and he currently has a ranking of 1,234.
Joining Nebraska
"I chose Nebraska because of the quality of the coaching staff (Peter Kobelt, Brett Forman, Shunya Maruyama) and the passion and professionalism they bring off the court," Dullinger said. “I'm confident this is the best place to develop to my fullest potential on and off the court."