Djokovic N. vs Struff J-L. prediction

Struff is playing against Djokovic in the third round of the ATP Cincinnati.The serbian has been tested positive with covid 19 1 month ago , after an friendly tournament and despite that he returned pretty fast and looks like hes game is not affected .He won against Berankis and Sandgren , despite winning in straight sets he had some work to do.In the other side Struff is in a great form , always capable of making good games when he is in form.He won against De minaur , Shapovalon and Goffin.I think Struff won't give up here and will try to get hes chances .I think there will be a tie break .My tip is over 19.5 games.