DonPavo

3pts R.Opelka to beat D.Young 3/1 Bet365

Great chance for the young 18yr old to progress here. He has just beat Kevin Anderson after being a set down and both of those 2nd and 3rd sets were real ball winners not tie-breaks. At 6ft 11 on the fast hard courts this guy isn't going to be easy to break and Donald Young comes into this out of form in my eyes and lucky to be here after 2 matches in a row he has scraped through after 2nd set tie-breakers and going through in 3 sets.
I also don't believe Young plays well against big servers. Isner holds a 4-0 record over Young, Karlovic a 2-0, Raonic a 3-0, Cilic a 2-0. Yes, these players are higher ranked so you'd expect them to be beating Young but even lesser ranked big serving players like Jack Sock (3-0) Querrey (2-0) have the upper hand over Young.
Hell even Ryan Harrison and Sam Groth have wins over Young in recent matches on the hardcourt. 
I'd advise the overs on the games (Over 22.5) or Opelka +3.5 at evens if you want a bet that's more likely to come in but I'm taking this one by the balls and will take a gamble on Opelka coming through to win. 

5pts F.Verdasco to beat J.Benneateau 2-0 Evens Sportingbet
4pts Y.Nishioka +3.5 games to beat A.Dolgopolov Evens Skybet
3pts J.Donaldson to beat N.Kyrgios 10/3 Bet365

Nishioka has a good chance against Dolgo but I'm backing Nish to keep it tight and going with the +3.5 handicap. Nish has beaten some good players in Evans, Ram etc and only really lost to the likes of Thiem and Muller when they've played just too good. Dolgo has been poor of late losing to Young and Querrey and even when he done well, like at Acapulco that was a tournament Dolgo was defending points after doing well the previous year. Here, he went out early last year to lowly ranked Go Soeda.
Verdasco has a 4-0 head-2-head and has only lost one set to Benneteau on the slow clay. I think this match could be a quick one. Benneteau is bang out of form and I'd be surprised if he got a set on the faster hard surface. Finally, Donaldson match looks like a sexy honey trap to me so I'm keeping the stakes low. I don't want no handicap on this as it could be a Kyrgios demolishing if he fancies it but will he? if Shapalalov can beat Nick, Jared certainly can as he is playing the best tennis of his career recently.