#8 The Undertaker vs. Edge
Edge and The Undertaker began feuding in 2007 when Edge screwed The Undertaker out of the World Heavyweight Championship at the Survivor Series. Edge had done so in order to make an impact upon his return after a near 4-month injury layoff.
The phenom would eventually earn the right to face Edge for the World Heavyweight Championship in the main event of WrestleMania 24 in 2008. Edge gave Undertaker arguably the best match Taker's Mania streak had seen up until that point, and the great matches didn't stop there. Taker and Edge would collide on 4 more pay-per-views, Backlash, Judgement Day and in a TLC match at the One Night Stand event in World Championship rematches, all of which were excellent, and later a Hell in A Cell at SummerSlam, which was phenomenal.
When you throw in the fantastic promo work from Edge and his 'fiance' Vickie Guerrero, it made for a truly excellent feud.