The one that's jumped out at me has to be Humbert in the Men's main draw - if he deals with Kyrgios (not had much game practice this year) then his section doesn't look all that bad to make progress in - will give anyone a test on grass, and he's away from Djoker's half of the draw. I've backed at some +150 prices so far.
He withdrew from the smaller event he was in this week early, after winning a R1 game, with food poisoning apparently - but pretty sure he's saving himself for the big event which makes sense.
Previously made 4th round at the main event of Wimbledon too couple years back on his only attempt. Course, he's now a Halle champion which is a fair pedigree.
Can see him being a big story in this year's draw. Several others he's beaten are trading shorter prices in the OR.