Outside of tennis:
Champions League Final 2005 - Used to love football and Liverpool used to be my faves, matches really don't get much better than that. No idea how Liverpool won that.
Canadian GP 2011 - Most entertaining race of all time.
I mean there's no logic to it, taking out Hamilton, taking out Alonso, getting a shitload of penalties, getting a puncture and with something like 20 laps remaining being in last place to overtake Vettel on the last lap is fucking unreal, in interchangeable conditions no one even comes close to Jenson.