Istomin won their only previous meeting. That was in September 2014 on a hard court and he won in 3 very tight sets.
Daniel has a better record on this surface in last 12 months.
Istomin reached the quarter finals last year and also in 2014. He has lost all 3 of his matches in 2016 though he was underdog in 2 of them.
Daniel also lost his 3 matches with 2 being as the underdog. He did take Rosol to 5 sets in Melbourne and Garcia Lopez to 3 sets in Chennai.
Value is on Daniel though I don’t trust either player to hang on to a lead.
Lay Istomin below 1.35. The sets should be tight.