My favorite match as Cage... it's a classic! And so much fun, at least as Cage.
This is a game of cat and mouse for both fighters. Cage is trying to peck his way in close, and Sub-Zero only wants Cage near if he's in the shape of an ice block.
CAGE
Two words- get in. No way is this a winnable match for Cage unless he is within sweep distance. The challenge lies in ACTUALLY getting in close, however. Sub-Zero has an anti-air roundhouse that will knock Cage out of jumps 10 out of 10 times. So try to time your jump kicks at the time when Sub-Zero throws a freeze. Once in close, the world is your oyster.... or should I say, Subby's body is your punching bag? It's a good idea vs Sub to use jump-around/crossover kicks, because if he ground freezes, you can jump-around kick him, and resume your attack when he gets up. Sub can run but he can't hide. Eventually you'll trap him in a corner, and that's where you can jab him most effectively. Only use his green ball projectiles from afar when it will win the round if traded with a freeze (or if you're trying to bait a freeze from Sub-Zero so you can JK).
SUB-ZERO
Cage will eat threw Sub up close like a knife through butter. Fortunately, Subby has some nice options to keep Cage away. Namely, his roundhouse and ground freeze. Sub-Zero isn't going to technically "win" from afar either, but he probably is going to lose from close up. Use clever freeze baits and moves like golden punches, to play mind games. Slide very rarely. If blocked, you'll be punished or at the very least, end up right in Cage's wheelhouse. If Cage throws a projectile, you want to trade hits for a freeze anyway, not slide under it. Of course, Cage expects Sub to run away, so a good tactic is to suddenly get aggressive with Sub at times.
I agree, 6-4 for Cage.