The biggest comeback I've ever had was only in a single set. After being down 0-5 and 15-30 (in a singles match), I rallied off seven straight games to win the set 7-5.
Sadly, my biggest choke came right after the second set, losing in a tiebreaker in lieu of the third set. I claim it as a choke because I had won 7 straight games but lost nearly 6 straight points in the tiebreaker immediately following my comeback. What a day.
I am an unpredictable player. Even I surprise myself with some of the shots I make.