Ferrer, by his standards has not been at his best this year and it looks like Father Time is catching up with him. As he has been so successful in the past, I think the bookies are over-valuing him - I don't think any match will be easy for him, especially on grass.
He's played in two grass court tournaments in the run up to Wimbledon and only won one match - against Sela three weeks ago. Both sets were close though, with only one break in Ferrer's favour.
Sela himself has been in decent form and has relatively good record on grass. After losing to Ferrer in 's Hertogenbosch, he went to Nottingham and reached the quarter finals. I think this match will be closer than people expect and the tip will be to go over 3.5 sets at 5/6.
The second part of this double is all about the fitness of Monfils. He hasn't played a match since playing in Rome on 9th May and had to miss the French Open through injury. The lack of match time and possibly practice time on the grass will mean it could take him a while to transition and feel comfortable on the court.
He doesn't have a great record at Wimbledon and has never gone past the third round.
Chardy has been affected by injuries a lot at Wimbledon and has had some tough draws down the years. Despite that, he has been to the round of sixteen in 2014, losing to Cilic, and does have some grass court pedigree.
If he serves well and gets on top of Monfils early, he will have a great chance of winning and the value is with him at 6/4.
The price of the double is 3.58/1.