I didn't get to watch, but it seems fairly likely his second half defender (#14 according to the comments on this board) was Vyacheslav Kravtsov (see https://www.eurobasket.com/Ukraine/basketball-National-Team.asp -- the current roster is messed up, but it indicates Kravtsov was #14 on the national team a couple years ago). Remember him? A couple years back there was some discussion on this board about possibly drafting him. Consensus seemed to be that he had even better defensive potential than Fes, but was even more of a project on offense.
Yeah, I googled him and thats the guy. Athletic and good defender. He beat Kanter down the court for a fast break alley oop. Seems like he could be in the NBA from a purely defensive/athletic/size standpoint.