Evgeny Donskoy vs Struff J. prediction

Our German star Struff will make his first debut against very solid hard court player Donskoy. I need to tell first, surface is very similar to US Open and they use Australian Open balls. So, It is very useful to look that tournament results. It will be his only 4th match on hard court. As we know, he likes clay surface. Struff is just 19-23 on hard in his career and he hasn't beaten any solid player since Thiem victory 2 years ago. It is very hard to back him on hard. Struff has only %73 serve hold on hard and breaks %18. Donskoy is far better than Struff on hard court. He is 127-73 in career and he holds his serve %86. Donskoy has beaten Struff twice already and he is coming off a title from Astana that will boost his confidence.