Well it's never going to be his favourite surface, that's for sure, but I think Del Potro has potential to be a dangerous man on the green stuff. Pros - Big serve, large wingspan Cons - Movement. Things to work on - Volleying. Saw a bit of his match and at one point he did slip and fall. Moving on the grass is going to be tricky for him, but that's where the pros directly balance the cons. His serve can be pretty scary. Who wants to run around the baseline on a surface that feels uncomfortable beneath your feet when you can end points quick? Del Potro is built to serve and volley a bit. His serve is big and at the net with those long arms, he'll not be the easiest man to pass. I was pleased to see him come in to net a fair bit in his match, probably more so than Nadal, Djokovic or Murray. If he can improve his vollying and build more court awareness, mix it up a touch more, then I think he can become much better on grass. His best result is a second round here, so that's not going to be hard to improve on. Simon could wait in the 3rd round, and if he could get past that then Nadal will most likely take him out. Not saying Del Potro can win Wimbledon, but I'm convinced he can adapt his game here to get much further in the next few years.