Rasmus and his twin brother, Nicolai, became the first brothers to win back-to-back events on the DP World Tour in 2021. Nicolai is the older twin (by a couple minutes).

Earned individual medalist honors (by four strokes over his twin brother, Nicolai) at the 2018 Toyota Junior Golf World Cup in Japan, leading Denmark to the team title.

Alongside his twin brother, Nicolai, and compatriot John Axelsen, helped Denmark win the 2018 World Amateur Team Championship, as Denmark recorded a one-stroke victory over a United States team which featured Cole Hammer, Collin Morikawa, and Justin Suh.

Represented Denmark at the 2018 European Amateur Team Championship (bronze medalists). Previously led Denmark to the team title at the 2017 European Boys' Team Championship.

Represented Europe at the 2018 Junior Ryder Cup.

Won the 2016 Danish International Amateur Championship.