0-40 Against Roger Federer Meant NOTHING

Down 0-40, three break points to save, most players are already halfway to losing the game. Against Roger Federer? It meant nothing. Time and again he'd calmly reel off five straight points like the deficit never existed. A serve here, an untouchable forehand there, and suddenly it's game Federer. This is a collection of the times the Swiss maestro turned 0-40 into just another hold, with the ice-cold clutch that made him the most feared frontrunner tennis has ever seen. Which comeback was the most ridiculous?