|2022||1||Buenos Aires (Outdoor/Clay)|
|2021||5||San Diego (Outdoor/Hard)|
|Bastad (Outdoor/Clay) 🏆|
|2020||1||Buenos Aires (Outdoor/Clay)|
- Former World No. 1 junior set new career-high ranking 6 times in 2020 despite 22-week ranking freeze, breaking into Top 50 in January and Top 25 in September.
- Became highest-ranked player and 1st ATP Tour champion from Norway by winning 2020 Buenos Aires, surpassing his father and coach Christian, who peaked at No. 39 after reaching 1995 Bastad final.
- Advanced to Grand Slam 4R for 1st time at 2021 Australian Open after qualifying at Australian Open, Roland Garros and US Open in 2018.
- Earned biggest wins of career over No. 8 Berrettini en route to 2020 ATP Masters 1000 Rome SF and No. 9 Schwartzman en route to 2021 ATP Masters 1000 Monte Carlo SF.
- Says that he loves golf just as much as tennis and even has an Instagram account dedicated solely to him and his friends golfing (@casper_golfer).