My #1 would probably have to be sOs vs Jaedong.
Jaedong had been on an absolutely unreal tear and was ruining people, leaving rubble in his wake, the Tyrant had returned. Yet perpetually haunted by his "Kong" moniker. But I mean whos kidding who, Jaedong is by far, to me, the greatest Zerg who ever lived. Who actually transitioned between both worlds, a very tough feat for most players like Flash. Who's potential was realized to a very very large extent at least. Yet this crushing crushing defeat of masterclass subterfuge and trickery from sOs just I think really blew everyones minds. Anyways, what do you guys think?