Mens US Open: Best bets for todays fourth-round games

Stanislas Wawrinka has the game to make life difficult for Novak Djokovic
We're nearing the business end of the men's draw at the US Open now, and Abelson Info has identified bets for all of today's encounters
Richard Gasquet (13) v David Ferrer(4) 17:00 Louis Armstrong Stadium
H-to-H 1-7
The head-to-head record here reads like a big smack in the chops for Gasquet supporters. Gasquet is a great player to watch and has all the tools but Ferrer is just the type of player who will frustrate him. Once you get under Gasquet's skin he can implode and you can be sure that will be Ferrer's aim. Note that in all seven of Ferrer's wins over Gasquet he has done so without Gasquet winning a single set so there is good reason to think that could happen again.
Selection: Ferrer 3-0 (Set Betting)
Janko Tipsarevic (8) v Philipp Kohlschreiber (19) 19:30 Louis Armstrong Stadium
H-to-H 2-2
We are getting to the stage where these types of encounters are going to be pretty tough to call. Both players have every reason to be confident. Kohlschreiber will be delighted with his fighting qualities and could either be a little jaded or battle hardened after his long matches. Tipsarevic squeezed through round one but since then has been ruthless and must surely be the fresher of the two. It could be tight but Tipsarevic will have too much consistency on his groundstrokes for the German.
Selection: Tipsarevic
Stanislas Wawrinka (18) v Novak Djokovic (2) 20:00 Arthur Ashe Stadium
H-to-H 2-10
Nobody has done it more easily than Djokovic. He has only dropped 14 games in three matches and has barely broken sweat. Things haven't been so easy for Wawrinka but you have to suspect that he will prove to be a much sterner test than Djokovic has come across so far. I don't see Djokovic losing this contest but Wawrinka is the kind of player that can have patches of outrageous tennis that you just can't do much about. He won't go down without a fight and I feel he will take one set off Djokovic before finally succumbing.
Selection: Djokovic 3-1 (Set Betting)
Juan Martin Del Potro (7) v Andy Roddick (20) 00:00 Arthur Ashe Stadium
H-to-H 3-1
This has all the hallmarks of one not to miss. Roddick is walking the career ending tightrope every time he steps on court now so the pressure must be immense. On a normal day I would say Del Potro will take this and without that much trouble - but this is no normal day. Roddick still has the tools and he will let it all go out there against the much fancied Del Potro. I like Del Potro to win this 3-1 sets but if Roddick gets up early then the score could easily go the other way - so cover your bets and have a look at the number of sets played market.
Selection: Four (Number of Sets?)