[1] Reintjes first competed in Euro Tour events in 2007,[2] where he reached the last 32 in his first professional competition, at the 2007 German Open.
[2] In 2008, he would once again reach the knockout rounds of Euro Tour events, at the Swiss and Austrian Opens, losing to Marcus Chamat 8–9, and Bruno Muratore 5–9.
Reintjes would defeat Murat Teker 9–8, John Abiven 9–1, Tomasz Kapłan 9-8 and Nick van den Berg 9–3 to reach the knockout rounds.
Reintjes then defeated Niels Feijen 9–6 in the quarterfinals, and Albin Ouschan 9–6 to reach the final of the event.
In the final, he would play Russia's Ruslan Chinakhov, and despite having a 4–2 lead, eventually lost 4–9.