The Ivory Coast international utilised the opportunity to score his third league goal of the season and help his side extend their winning run to three games.
Yatabare also played a key role in the victory, netting his first league goal of the season and second strike in 16 appearances across all competitions.
The game started with both sides aiming to outwit each other and Gradel broke the deadlock moments before the half-time break after he was set up by Claudemir.
Hakan Arslan doubled Sivasspor‘s lead in the 71st minute after receiving a timely assist from Faycal Fajr.
Yatabare then sealed the victory with four minutes left to full-time, firing his effort past the reach of goalkeeper Kristoffer Nordfeldt to render Arda Kizildag’s late strike a mere consolatory goal.