Kist made his debut in the 2015 PDC World Championship after qualifying through the Pro Tour Order of Merit and was knocked out 3–1 in sets by compatriot and fellow former BDO world champion Jelle Klaasen in the first round. After his first year in the PDC he was ranked world number 45. After trailing Ian White 6–0 in the third round of the UK Open, Kist responded to send the match into a deciding leg but lost it to be eliminated 9–8. He lost in the quarter-finals of the second Players Championship 6–4 to Andrew Gilding and went a stage further at the seventh event by knocking out world number one Michael van Gerwen 6–4, but was then beaten 6–1 by Peter Wright in the semis. Kist lost 6–4 in the first round of the European Championship to Rowby-John Rodriguez.