Murray has a negative H2H against Novak, Nadal and Federer have a positive. So how has he competed with him better than any other player?
Welllll, Djokovic was 4-0 on Murray until Toronto 08. They're the same age, had paralleled each others' rise, but Murray lost quite a bit of progress to a snapped wrist tendon in 2007. Since Murray's breakthrough at Wimbledon 2008, they're 7-7. Murray should have won Shanghai last year too, so far on top. Also Rome 2011, served for the match.
Nadal's h2h vs Djokovic is 12-2 on clay, but 7-12 elsewhere.
Federer's record vs Djokovic is split by date - pre 2011 Fed led 13-6, but 2011+ 3-7.