Close to 0 I'd say lol. Berdych isn't exactly in good form, and even at his best is prone to losing to nobodies. Soderling has proved that he is able to win even when not playing well, and will usually make it to at least the QF, whereas Berdych can go out in the 1st round lol (like USO). He'll still make the WTF though, so no worries there.
Djokovic is perhaps the most consistent player on tour when it comes to making the later rounds of events. Murray can lose to people like Fish early in a tournament, which is why Djokovic always seems to have more points than him. Despite that, I'd say Murray has a better chance of winning a major than Djokovic has of winning another one (I actually think both will happen).