At SummerSlam on August 17, Lesnar defeated WWE World Heavyweight Champion John Cena to become the Champion; during the match he delivered sixteen suplexes (most of which were German suplexes) and two F-5s to Cena, who barely managed any offense.
In a rematch at Night of Champions on September 21, Lesnar was disqualified due to Seth Rollins interfering, but retained his championship.
Later in the year, Rollins reunited with The Authority and was added to Lesnar's and Cena's championship match at the Royal Rumble on January 25, 2015, making it a triple threat match, which Lesnar won despite (storyline) breaking a rib during the match.

Lesnar's next challenger was Roman Reigns, who had won the Royal Rumble match to earn a title match at WrestleMania 31 on March 29.
During his main event match against Reigns, Lesnar delivered multiple suplexes and was heard exclaiming, "Suplex City, bitch!"
and thereafter "Suplex City" became one of his signature catchphrases and merchandise motifs.
After Lesnar and Reigns traded a few false finishes, Rollins cashed in his Money in the Bank contract while the match was in progress, making it a triple threat; Rollins then pinned Reigns to win the title.
The following night on Raw, Lesnar tried to invoke his rematch clause and subsequently attacked commentators Booker T, John "Bradshaw" Layfield and Michael Cole, as well as a cameraman after Rollins refused the rematch, which led to Stephanie McMahon suspending Lesnar indefinitely in storyline.

Lesnar returned on the June 15 episode of Raw, being chosen by The Authority as the number one contender to Rollins' WWE World Heavyweight Championship at Battleground.
On July 4, Lesnar made his first non-televised wrestling appearance for WWE since his 2012 return, defeating Kofi Kingston at The Beast in the East live event in Tokyo in a quick winning effort; he also delivered F-5s to Kingston's New Day stablemates Big E and Xavier Woods after the match.
At Battleground on July 19, Lesnar dominated Rollins, delivering thirteen suplexes, but mid-pinfall, after performing an F-5, he was attacked by The Undertaker (who incapacitated Lesnar with a chokeslam and two Tombstone Piledrivers), thus ending the match with Lesnar winning by disqualification and Rollins retaining the championship.
At SummerSlam on August 17, Lesnar defeated WWE World Heavyweight Champion John Cena to become the Champion; during the match he delivered sixteen suplexes (most of which were German suplexes) and two F-5s to Cena, who barely managed any offense. In a rematch at Night of Champions on September 21, Lesnar was disqualified due to Seth Rollins interfering, but retained his championship. Later in the year, Rollins reunited with The Authority and was added to Lesnar's and Cena's championship match at the Royal Rumble on January 25, 2015, making it a triple threat match, which Lesnar won despite (storyline) breaking a rib during the match.
Lesnar's next challenger was Roman Reigns, who had won the Royal Rumble match to earn a title match at WrestleMania 31 on March 29. During his main event match against Reigns, Lesnar delivered multiple suplexes and was heard exclaiming, "Suplex City, bitch!" and thereafter "Suplex City" became one of his signature catchphrases and merchandise motifs. After Lesnar and Reigns traded a few false finishes, Rollins cashed in his Money in the Bank contract while the match was in progress, making it a triple threat; Rollins then pinned Reigns to win the title. The following night on Raw, Lesnar tried to invoke his rematch clause and subsequently attacked commentators Booker T, John "Bradshaw" Layfield and Michael Cole, as well as a cameraman after Rollins refused the rematch, which led to Stephanie McMahon suspending Lesnar indefinitely in storyline.
Lesnar returned on the June 15 episode of Raw, being chosen by The Authority as the number one contender to Rollins' WWE World Heavyweight Championship at Battleground. On July 4, Lesnar made his first non-televised wrestling appearance for WWE since his 2012 return, defeating Kofi Kingston at The Beast in the East live event in Tokyo in a quick winning effort; he also delivered F-5s to Kingston's New Day stablemates Big E and Xavier Woods after the match. At Battleground on July 19, Lesnar dominated Rollins, delivering thirteen suplexes, but mid-pinfall, after performing an F-5, he was attacked by The Undertaker (who incapacitated Lesnar with a chokeslam and two Tombstone Piledrivers), thus ending the match with Lesnar winning by disqualification and Rollins retaining the championship.
Brock Lesnar