He started his professional career in 2015.
In 2018, Ruud qualified for his first Grand Slam at the 2018 Australian Open after going through the qualifying competition. This made him the first Norwegian to qualify for a Grand Slam main draw in 17 years.
In the 2019 season, Ruud lost in the first qualifying round at the Australian Open, but qualified for the 2019 Rio Open, and won against Carlos Berlocq and fifth seed João Sousa before losing to Laslo Đere in two sets.
At the 2020 US Open, he reached the third round after defeating Mackenzie McDonald in a five set match in the first round.
At the 2021 Australian Open Ruud progressed to the fourth round in a Grand Slam for the first time.
Ruud reentered the top 25 to a career high ranking of No. 24 on 22 February 2021.
On his debut at the 2021 Monte-Carlo Masters Ruud recorded his second top-10 win after beating Diego Schwartzman in straight sets in the second round.
At the 2021 Mutua Madrid Open in another debut, Ruud recorded his first top 5-win in the third round after defeating Stefanos Tsitsipas in straight sets.
As a result of his performance in Madrid, Ruud entered the top 20 for the first time in his career, rising to a new career high ranking of No. 16 on 10 May 2021.
Ruud did not participate in 2022 Australian Open due to an injury. Shortly after his recovery, he entered into the 2022 Argentina Open in which he eventually defeated Diego Schwartzman in the final and clinched his seventh career ATP singles title.
Casper Ruud's net worth is currently estimated at $7 million.
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