Nickname is Grieki Father, Ron is a former motocross driver; mother, Monique is a tennis instructor; twin brothers, Scott and Kevin, also played pro tennis Began playing tennis at age 5, inspired by his brothers, who are 5 years older "I’ve always had them to look up to," Griekspoor said of his brothers. "They were always better than me until a certain age. I would always practise with them, travel with them. Having that sports background means a lot." Moved to Belgium at age 17 to train with former Top-30 player Kristof Vliegen Favourite surface is clay, shot is forehand and tournament is Rotterdam Lists Melbourne as his favourite city on tour Idol growing up was Andy Murray: "The work he puts in, it's amazing to see for me. What he achieved in the time of Rafa and Roger and Novak, it's amazing. I like his attitude on court. He can go nuts, but the next point he's fighting like 200 percent. The drive he has and how hard he works is unbelievable." If he wasn't a tennis player, he would be a Formula 1 driver Says that Belgian-Dutch driver Max Verstappen is his hero Favourite athlete is Dutch motocross racer Jeffrey Herlings "I'm a big, big fan of Motocross," he says."I can't say that I like it more than tennis, but I like it as much as I like tennis. Like my dad, I did it when I was young. Those guys work so hard and it's really physical. The feeling it gives you to ride this fast, it's everything for me." Also enjoys football. Favourite team is AFC Ajax Favourite superhero is Spider-Man, TV show is Casa de Papel, actor is Paul Walker and musician is Dutch DJ Martin Garrix Fan of all of the Rocky and Creed movies Favourite food is sushi and school subject was math Says that kindness is his best quality and lateness is his worst quality Motivation: "I played Wawrinka in Rotterdam in 2018. It was sold out, with 15,000 people. The energy of the crowd was amazing. This is why I play tennis. To play these big guys. I live for these moments." Best advice received: "My dad would tell me to always work hard no matter where you are in life. Always work hard, be humble and just be yourself."

Earned personal-best 36 wins in 2023, won 1st ATP Tour title in Pune and achieved career-high No. 21 in November

Went 17-3 on home soil in 2023-24, highlighted by 2nd title at 2023 ‘s-Hertogenbosch and rallying from a set down for win over No. 8 Hurkacz en route to 2024 Rotterdam SF

Rallied from a set down for Rotterdam wins as WC over No. 13 Wawrinka in 2018, No. 11 Khachanov in 2019, No. 14 Karatsev in 2022, No. 17 A. Zverev in 2023 and for ‘s-Hertogenbosch win over No. 18 de Minaur in 2023 – earning first 5 of 15 career Top-20 wins on home soil

Upset No. 2 Zverev in 2025 Indian Wells 2R to become 1st Dutch ATP Masters 1000 quarter-finalist since Haase in 2018 and did not drop a set en route to 2025 Mallorca title

Went 8-0 in finals and 42-7 overall on ATP Challenger Tour in 2021, setting single-season record for most titles and ending season with 25 straight wins