10 Greatest Rivalries in The History of WWE SmackDown

#3 Rey Mysterio vs. Eddie Guerrero

SmackDown's most personal feud

Longtime friends Rey Mysterio and Eddie Guerrero, who's real-life friendship was brought into TV in 2004, formed a tag team at the end of the year which would see them become the WWE Tag team Champions at No Way Out 2005.

A seemingly jealous Chavo Guerrero encouraged the two to have a match at WrestleMania 21. Rey would defeat his tag team partner in the friendly match. Tensions grew between Eddie and Rey when Chavo and others said that Eddie couldn't defeat Rey, and things only got worse when Eddie and Rey lost the Tag titles to MNM. Eddie eventually turned on Rey, attacking him after a match and leaving in in a bloody state.

This set up a match at Judgement Day, which Guerrero lost to Mysterio by disqualification after hitting Rey with a chair. In the weeks following, Guerrero threatened to reveal a secret about Mysterio and his son Dominick. The storyline grew to involve the families of both men, with both sides pleading for Guerrero not to reveal the secret. A match was made for The Great American Bash, with a stipulation that if Guerrero lost, he would not tell the secret and despite Rey winning, Eddie reveled it anyway, that he was Dominick's actual father, who was had out of wedlock.

This led to an excellent Ladder match at SummerSlam, where the winner, Rey, would receive Dominick's custody papers. The feud ended a few weeks later when Eddie finally beat Rey in a thrilling Steel Cage match. The feud was very dark and uncomfortable at times, but the segments were very well done, the matches were excellent and drama was incredible.