[citation needed] Kleermaker won a PDC Tour Card for the first time at European Q School in 2020.

[citation needed] In 2021, Kleermaker made it to the last 16 in 2021 UK Open, winning over Wayne Jones, Martin Schindler, Jamie Hughes and Callan Rydz, losing to Luke Humphries 4-10.

Later on in the year Kleermaker made his debut on 2021 World Grand Prix, where he lost 0-2 on sets to Mervyn King.

[citation needed] After withdrawal in 2021, Kleermaker debuted on 2022 PDC World Darts Championship and made it to last 16 after wins over John Michael, Simon Whitlock and Joe Cullen, then losing 0-4 on sets to James Wade.

[citation needed] Following the 2023 Grand Slam of Darts, Kleermaker announced that he would be handing in his tour card at the end of the year, citing his desire to spend more time with his children as the driving force behind his decision.