Donald Young vs Denis Istomin prediction

I consider Donald Young as better player on grass, as already shown on several previous tournament he followed; by far Young had 4/2 record on grass, far better than Istomin who always lose on his grass tournament recently (0/3 record). This clash possibly ends in tight game and very likely will have 4 or even 5 sets, but I fancy Donald Young will through his first round in this tournament. He has good big serve which will be very useful in this surface. Donald Young will win with -3 games handicap.