Wattimena won the first event he entered as he claimed the 2008 Malta Open by beating Vincent Busuttil in the final. He made his
British Darts Organisation debut in a major event at the
World Masters and won four games to reach the last 24 where he lost 3–0 to Steve Douglas. In 2014, Wattimena won the German Gold Cup courtesy of defeating
Jan Dekker 3–2 in the final. Later in the year he qualified for the
2015 PDC World Championship by winning the Central European Qualifier, concluding with a 6–3 victory over Kenny Neyens. Wattimena entered the event in the preliminary round and narrowly lost 4–3 to
Robert Marijanović, missing three match darts in the final leg. He entered PDC Qualifying School in January 2015 and was eliminated in the final round of the third day by Steve Douglas. However, Wattimena had already done enough through the Order of Merit to not even need to play on the fourth day as he finished joint second on the Order of Merit to earn a two-year PDC tour card. He qualified for the
UK Open and defeated Jonny Clayton 5–1 in the first round, but then lost to
Kevin McDine 5–4. Wattimena twice lost in the last 16 of
Players Championship events during the year and beat
Robert Marijanović 6–5 at the
European Darts Grand Prix, but was then knocked out 6–3 by
Peter Wright in the second round. In the first round of the
2016 World Championship, Wattimena lost 3–1 to
Mensur Suljović. He overcame
Andy Smith 6–5 and Kevin Dowling 6–1 at the
UK Open, before losing 9–7 to
Alan Norris in the third round. At the 15th
Players Championship wins over
Jonny Clayton,
David Pallett,
Peter Wright,
Simon Stevenson and
Jelle Klaasen ensured Wattimena played in his first PDC semi-final and he was defeated 6–3 by
Michael van Gerwen. He qualified for seven European Tour events during the season and, although he didn't get past the second round in any of them, his consistent play saw him make his debut in the
European Championship, where he lost 6–1 to
Mensur Suljović in the first round. He lost 3–1 in the opening round of the World Championship for the second year in a row in the
2017 event, this time to
Daryl Gurney. He knocked out Mick Todd,
Dave Chisnall,
Robert Thornton,
Kyle Anderson and
Benito van de Pas at the seventh
Players Championship to reach his second PDC semi-final, where he was defeated by
Kim Huybrechts 6–3. He reached third PDC semi-final at Players Championship 17, where he beat
Alan Tabern,
Berry van Peer,
Peter Hudson,
Steve Beaton and
Justin Pipe, before losing to
Kevin Painter 6–3. He qualified for five European Tour events over 2017, failing to make it past the Last 32 in any of them, meaning he did not qualify for the
2017 European Championship. He made a third Players Championship semi-final of the year in the final weekend in Barnsley, at Players Championship 21, where he knocked out Ross Twell,
Ian White,
Kevin Painter,
Peter Jacques and
Michael Smith, before a 6–2 defeat to
Adrian Lewis. This was enough for him to qualify for the
Players Championship Finals, as the 29th seed. Wattimena started off with a 6–0 whitewash win against
Keegan Brown. He saw off
Mickey Mansell 6–3 in the second round. However, in the last 16, he was defeated 10–9 by
Steve Beaton in a deciding leg, having levelled from 9–5 down. He picked up £8,000 from the Players Championship Finals. Wattimena reached a career-high of 17th in the
PDC Order of Merit in November 2019. Wattimena's consistent improvement and progression up the rankings was rewarded with a 'challenger' spot for the
2020 Premier League in
Rotterdam. On the
PDC European Tour Wattimena reached the quarter-finals at both the
2024 Belgian Darts Open and the
2024 German Darts Grand Prix. He lost at the quarter-final stage to
Luke Littler and
Michael van Gerwen respectively, each 6–2 in legs. Wattimena also reached the quarter-finals at the
2024 Czech Darts Open, losing to
Kim Huybrechts 6–4. At the
2024 European Championship, Wattimena reached a first major televised final, losing 11–3 to fellow maiden finalist
Ritchie Edhouse. After five runner-up finishes in PDC ranking finals, he claimed his first title at
Players Championship 23 (PC23) on the
2025 PDC Pro Tour by defeating
Lukas Wenig 8–5. He won a second title of the year at
PC31. ==World Championship results==