For reference, the eliminating matches, according to post timestamps.
Life R6:

Sld Dm1321
3-0 
Gen dawn to dusk
Gravity R7:

Gen RootRanger
3-1 
Gen Captain Scibra
Earth R7:

Sld Regyptic
3-1 
Gen MegroN
Death R7:

Gen hainkarga
3-1 
Sld Laxadarap
Air R7:

Sld Kuroaitou
3-0 
Gen Afdarenty
Water R8:

Sld Kuroaitou
3-2 
Gen ddevans96
Light R8:

Sld Regyptic
3-0 
Gen Jen-i
Entropy R9:

Sld inthisroom
3-1 
Sld RavingRabbid
Aether R10:

Sld DeathKnyte (subbed by inthisroom)
3-2 
Lt Dm1321 (subbed by Ginyu)
Time R11:

Sld mrpaper (subbed by Zawadx)
3-0 
Lt Kuroaitou
Darkness R12:

Lt mrpaper (subbed by RootRanger)
3-1 
Sld inthisroom