IV - Sith, 1-0 (Vader > Kenobi)
V - Sith , 1-0 (Vader > Skywalker)
VI - Jedi 1-0 (Skywalker > Vader)
I - Tie 1-1-1 (*Jin- Maul draw; Maul > **Jin, Kenobi > Maul) *Jin retreated, **Started off 2 Jedi vs 1 Sith
II - Sith 2-0-1 (*Dooko > Kenobi & Skywalker, draw with Yoda) * Also started off as 2 Jedi vs 1 Sith
III - Sith, 4-1-1 (*Sidious > 3 Jedi, draw with Windu; Kenobi > Vader; Sidious > Yoda [submission]) * Started out as 4 Jedi vs 1 Sith
VII - No Sith vs Jedi duels in this movie.
R1 - No Sith vs Jedi duels in this movie.
By my count, Sith are up 9-2-3, and that's with the Jedi trying to gang up on them more than once.