[1] Zielinski began playing pool at aged 8 in 2009, and in 2013 entered his first competition, the Junior European championships.

[4] He won the junior straight pool championship again in 2017, whilst also finishing runner-up at the 9-ball and 8-ball events as well.

[5] In 2017, aged 16, he became the youngest player to win an event on the Euro Tour, when he won the 2017 Treviso Open.

He finished tenth on the rankings list at the end of the 2017 Euro Tour season.

[10] At the 2017 WPA World Nine-ball Championship, Zielinski lost his initial match to Cheng Yu-hsuan before winning his final match of the double elimination round against Mario He 9–8, to reach the knockout round.