I dig that it wasn't an upset because you felt you had the obvious better team, but just out of curiosity, why did he finish ahead of you in the regular season? Did your team get off to a slow start, you buy better players as the season went on, or what? How did you fare against him in the season?
He won both games against me in the season - the second because he CTd in order to avoid me in the playoffs. It didn't work because the (then) first place team deliberately lost the last game to avoid me.
The main reason he finished ahead of me was because of training. I was playing my horrible SG at PG for OD training which cost me at least 4 games. I also bought a couple of players in the middle of the season, primarily my $200k center but also my $100k PG.