I am picking Chardy over Mayer ($22/$22 (EV)
I am picking Dimitrov over Stepanek ($30/$22)
I am picking Fognini over Granollers ($20/$28)
Overall i feel the best about the Dimitrov bet, Chardy i think picks off Mayer because Mayer is coming back down to Earth after a recent big upset, and Fognini is just a solid stab in the dark.
best of luck all