Casper started playing tennis at the age of four with his father, a former Top-50 tennis player. At the age of 15, he made the quarterfinals at the Junior US Open and began the 2016 season as the No. 1 ranked junior player in the world.
Four years later, in January 2020, Casper broke into the ATP top-50. He won his first ATP title at 2020 Argentina Open in February, and in 2021, Casper won a remarkable ATP five titles. Casper ended the year as World No. 8, breaking into the top-10 in September.
Entering 2022, Casper wasn't shy about vocalizing his goals. He wanted to make a quarterfinal of a Grand Slam, something he had not accomplished in his 19 slam appearances. At Roland-Garros, Casper made his breakthrough. He reached the finals of the French Open, eventually falling to Rafael Nadal. With his finals' run, Casper moved up to his career-best ranking of World No. 6.
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- 1x Grand Slam Finals (Roland-Garros, 2022)
- 1x ATP Finals Qualifier (2021)
- 2022 Swiss Open Champion
- 2022 Argentina Open Champion
- 2021 San Diego Open Champion
- 2021 Generali Open Champion
- 2021 Swiss Open Champion
- 2021 Nordea Open Champion
- 2021 Austrian Open Champion
- 2021 Swiss Open Champion
- 2021 Swedish Open Champion
- 2021 Geneva Open Champion
- 2020 Argentina Open Champion
