Pieters was born in Geel, Belgium in 1992.[1] He started playing golf at the age of five, learning the game at the Witbos Golf Club in Noorderwijk, Belgium.[5]
In summer 2013, Pieters decided to forgo his senior year at the University of Illinois and turn professional. He made his debut on the European Tour in July at the Alstom Open de France, where he finished 29th; at the end of the year, he battled through all three stages of the European Tour Qualifying School taking the 20th card at the Final Stage, and qualified to play on the European Tour.
In 2015, he started with a 4th-place finish at the Abu Dhabi HSBC Golf Championship which took him to #156 on the OWGR. In August and September, he won the D+D Real Czech Masters and the KLM Open in consecutive tournaments played and moved into the top 100 in the OWGR. The two wins and five top-10 placements of the season gave him a final 29th place in the Race to Dubai.
Pieters started 2016 at the Abu Dhabi HSBC Golf Championship, where he finished 2nd. In August, he represented Belgium at the 2016 Summer Olympics, finishing in 4th place. In the same month, he obtained a second place at the 2016 D+D Real Czech Masters and won the 2016 Made in Denmark. He was chosen by Darren Clarke as a captain's pick for the 2016 Ryder Cup.
Pieters' opened the 2017 season with a tie for 2nd at the Genesis Open in February and followed that up with a top-5 finish at the WGC-Mexico Championship. Those finishes moved Pieters to 29th in the Official World Golf Ranking and qualified him for his first Masters Tournament where his finished 4th. He capped a successful summer with his second top-5 finish at a WGC event when he finished 4th at the WGC-Bridgestone Invitational. That finish moved him into the top-25 of the OWGR. In September 2017, the European Tour announced that it would be returning to Belgium for the first time in 18 years with Pieters hosting the Belgian Knockout – a unique strokeplay and matchplay format – in May 2018.[8]
In August 2019, Pieters shot a 3-under 69 to become the first golfer to win the D+D Real Czech Masters for the second time, beating Adri Arnaus by one stroke.[10]
Pieters claimed his fifth European Tour victory in November 2021 at the Portugal Masters.[11] Two months later, Pieters won the Abu Dhabi HSBC Championship for his sixth European Tour win and first Rolex Series victory.[12]
In February 2023, it was confirmed that Pieters had joined LIV Golf.[13]
Amateur wins
2009 International of Belgium Junior Championship
2011 Jack Nicklaus Invitational, Belgian Stroke Play Championship
QF, R16, R32, R64 = Round in which player lost in match play
"T" = tied
NT = No tournament
Note that the Championship and Invitational were discontinued from 2022.