There have been a lot of great matches this year from a lot of different regionals. I remember watching one in Midwest where a robot made a hurdle at the last second to win the match (don't know what match number). Also in Florida, when 103 was matched up against 3 other robots, they held their own even though they lost the match.
Forgive me for including a match that my team participated in this year, but
this was easily my favorite match that we were a part of. The match number is 48.
As to a nail biter,
here's one that I think many will remember from last years' game on Einstein. Talk about down to the wire!