before attacking the challenger and hitting him with a 619 around the steel post. On July 23 at The Great American Bash, Mysterio lost the World Heavyweight Championship to King Booker after Chavo interfered in the match and turned on Mysterio, hitting him with a steel chair. Guerrero cost Mysterio his rematch the following week. This culminated in a match at SummerSlam on August 20, where Mysterio lost to Guerrero after Vickie Guerrero tried to stop both men from fighting, but accidentally knocked Mysterio off the top turnbuckle. Vickie then along with Chavo turned on Mysterio after she hit him in the back with a steel chair and gave him an injury, thus, siding with Guerrero. Mysterio then defeated Guerrero in a Falls Count Anywhere match at No Mercy on October 8. Subsequently, Guerrero challenged Mysterio to an "I quit" match for the October 20 edition of SmackDown!. In that match (which Mysterio lost), Guerrero injured Mysterio's knee, using the match to write Mysterio out of the storyline for a while to get knee surgery. Mysterio made his in-ring return at SummerSlam on August 26, 2007, defeating Guerrero, after Guerrero obsessed over Mysterio's return as well as wanting to injure Mysterio again. On the August 31 episode of SmackDown!, Mysterio won a "Championship Competition" to become the number one contender for the World Heavyweight Championship, defeating Batista and Finlay. On the September 7 episode of SmackDown!, Mysterio had an "I Quit" match with Guerrero, which he won after hitting Guerrero's knee with a steel chair repeatedly in a similar manner to which Mysterio had been put out of action, to end the feud. Mysterio then began a feud with The Great Khali, which led to a World Heavyweight Championship match at Unforgiven on September 16. The match was later made a Triple Threat match, also involving Batista, who won it. Various storylines (2007–2009) Mysterio then began a feud with Finlay, an opponent chosen by JBL. The rivalry was marked as "Fight vs. Flight", contrasting the fighting styles of both wrestlers – Finlay's physicality, versus the high-flying Mysterio. After fighting to a "no contest" at No Mercy on October 7, followed by a double-disqualification in a number one contender's match for Batista's World Heavyweight Championship on the next SmackDown! he defeated Finlay in a Stretcher match at Cyber Sunday on October 28. During this feud, he lost a match to Finlay