Dolgopolov matches often have strange betting patterns. i mean just look at the guy and from which country he's coming from. shouldn't surprise anyone.
Usually when guys crack the top40 they leave this sort of thing behind though, prize money is then enough to take care of that.
I hate to say it too, cos I really like Petz's game, but that's about the 5th like this in the last year for him (admittedly the others weren't as dodgy as this). The previous ones weren't enough alone, and perhaps I was a little biased ignoring them, but in this context they don't look good.