Sweden's Mats Wilander is conisdered by many to be one of the best analysts in the game today. The Swede is also a former world no. 1 and multiple grand slam champion so he definitely knows what he's talking about. Wilander has now come out and said thathe does not think Juan Martin del Potro and Tomas Berdych will win a grand slam title soon.
Speaking to the Tennis Space website on players outside the top 4, Wilander commented, "I think Jerzy Janowicz is dangerous, I think Milos Raonic is dangerous. I don’t think that Del Potro, Tsonga, Berdych will step up and win a major. I think 5 through 50 needs to step up. They need to improve. Their level has to go way up. They are never going to beat three of the four, we’ve never had four like that at the same time. They need to break in, take someone out in the early rounds, we need them to not fall into the trap of thinking ‘oh these guys are the best, how can I beat them.’ There needs to be more stupid belief from them, more fire from the group behind. They have to help each other pave the way. They all need to have the same mindset so that one can slip through by only beating one of the top four."