I feel Murray is better than Djoko vs. the very biggest servers. The way he got those 135-147 mph serves back with interest, even when they came right on his body, was mind blowing.Also, we currently have 2 utterly insane returners operating on tour: Andy and Novak.
They're not just excellent returners, they're borderline freakish with their ability to send back a ridiculous serve, deep, often at the feet of the server - who immediately is wondering how the hell he's suddenly being faced with a half volley on the service line.
Some of the big serves these 2 get back with interest, well, I don't think I've ever seen anything quite like it. So many free points are ripped away from big servers' game when playing them. If one of them has an off-day, a Querrey might be able to blast their way through, but if either of them are anywhere near decent form, a big server always gets nullified.