Kokkinakis - Istomin Tennis prediction

Thanasi Kokkinakis return after hard injury in 2015. Hes very talented. In 2015 he had 69 ranking in the world. Also had 14 wins and 3 loses on clay i that year. Hes much batter player on clay , then Denis Istomin. But ofcourse favorite is Istomin, because Kokinakis do not play such a long time. But he is hungry for tennis, and i blieve that will be tough match. Totybet are 21,5 over with 1,60 ods , and 22,5 with 1,85. Both o them great serve players, so i guess 1 tie break in this game. That means easy over.