 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.On 24 November 2018, Pieters won the 2018 World Cup of Golf with partner Thomas Detry, representing Belgium, at Metropolitan Golf Club in Melbourne, Australia.On 18 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.