UFC 97: Redemption (not to be confused with UFC 17: Redemption) was a mixed martial arts event held by the Ultimate Fighting Championship (UFC) on April 18, 2009 in Montreal, Quebec, Canada. It broke the UFC attendance record that was set 364 days earlier in Montreal at UFC 83, by 61 people.

On February 12, 2009, reports surfaced that province regulators ("Régie des alcools, des courses et des jeux", or RACJ) requested a set of rule changes that differ from the Unified Rules of MMA put the event at risk from taking place. The proposed rule changes banned elbow and knee strikes, mandated a smaller cage, and would stop a fight when a fighter gets knocked down. Before, the RACJ has followed the Unified Rules, but as laws differ by city, state, or province, a commission can insist on the usage of its own rules.

On February 18, 2009, it was announced that UFC officials were able to convince the RACJ to reverse its stand and use the Unified Rules. As a concession, the UFC agreed to the banning of foot stomps for this event.

Dana White (born July 28, 1969) is the current President of the Ultimate Fighting Championship (UFC), a mixed martial arts organization based in the United States.

Born in Manchester, Connecticut on July 28, 1969, White grew up in Las Vegas, Nevada, Ware, Massachusetts and Levant, Maine. White is a passionate Boston Red Sox fan. During his youth, he bounced back and forth between Boston and Maine. He attended the University of Massachusetts Boston but did not finish; however, while there he did launch a boxing program for inner-city youth.

White has a background as an aerobics instructor. In 1992, White established Dana White Enterprises in Las Vegas. He conducted aerobics classes at three gyms in the Las Vegas area and began managing MMA fighters Tito Ortiz and Chuck Liddell.

While working as a manager, White learned that Semaphore Entertainment Group, the parent company of the UFC, was looking for a buyer for the UFC. White contacted childhood friend Lorenzo Fertitta, an executive at Station Casinos, and a former commissioner of the Nevada State Athletic Commission. Within a month, Lorenzo and his older brother Frank bought the UFC, with White installed as its president. White currently owns about 9% of Zuffa, LLC, the entity the Fertitta brothers created to own and manage the UFC.

Anderson da Silva (Portuguese pronunciation: [ˈɐ̃deʁsõ ˈsiwvɐ]; born April 14, 1975) is a Brazilian mixed martial artist. He is the current UFC Middleweight Champion and the promotion's longest reigning champion. With 14 consecutive wins and 9 title defenses, Silva holds the longest winning streak and title defense streak in UFC history.

Silva is ranked as the number one Middleweight in the world by multiple publications, and is the consensus No. 1 pound-for-pound fighter in the world according to ESPN, Sherdog, Yahoo! Sports, MMAFighting.com and other publications. UFC president Dana White has proclaimed Silva as "the greatest mixed martial artist ever."^{[undue weight? – discuss]} Silva is also the last Cage Rage Middleweight Champion and a former Shooto Middleweight Champion. Besides the UFC and Cage Rage, Silva has fought for a number of other MMA promotions including the Pride Fighting Championships, Shooto and Rumble on the Rock.

Although known primarily for his mastery of Muay Thai striking, Silva is also a Brazilian Jiu-Jitsu blackbelt, a rank he earned in 2006 from Antônio Rodrigo Nogueira who follows Gracie Lineage through Carlson Gracie, like Murilo Bustamante and the Brazilian Top Team. He began martial arts training at the age of 14, training Tae kwon do and earning a black belt by the age of 18. He is also a black belt in Judo and a yellow rope in Capoeira.

Thales Leites Lourenço (Portuguese pronunciation: [ˈtaliʒ ˈlejtʃiʃ]; born September 6, 1981) is a Brazilian mixed martial artist. He is the current Superior Challenge middleweight champion.

A relative newcomer to the sport, Leites made his mixed martial arts debut at Shooto Brazil in 2003, defeating Felipe Arinelli by arm-triangle choke submission. Leites would win his next two fights in Vitória before making his debut in the United States in Hawaii's Rumble on the Rock promotion in 2005, where he defeated Adam Roland in his fourth consecutive mixed martial arts victory.

After a successful outing in the U.S., Leites returned to Brazil to fight Gustavo Machado, who was coming off two wins in the Japanese Pancrase organization. Leites defeated the more experienced Machado by submission in the third round, and was invited back to Rumble on the Rock to fight Hawaiian Ronald Jhun in September. Despite fighting a hometown favorite, Leites notched his sixth victory, defeating Jhun by technical knockout in the later half of the fight.

Charles David "Chuck" Liddell (born December 17, 1969) is a retired American mixed martial artist and former Ultimate Fighting Championship light heavyweight champion. Liddell has an extensive striking background in Kempo, Koei-Kan karate and kickboxing, as well as a grappling background in collegiate wrestling. Liddell is known for his Knockout power, Iron chin, Excellent counter striking and for his sprawl-and-brawl technique, which made him one of the most difficult fighters to takedown. He is one of the most dominant champions that ever competed in the UFC. He still holds the record for the most knockouts in UFC history. As of his retirement, Liddell has had 23 fights in the UFC. Along with fellow UFC Hall of Fame fighter Randy Couture, Liddell is widely credited for bringing mixed martial arts into the mainstream of American sports and entertainment. On July 10, 2009, he was inducted into the UFC Hall of Fame.

Liddell began studying Koei-Kan karate at the age of 12; the tattoo seen on his scalp reads "Koei-Kan". Liddell was a four-year starter on the football team at San Marcos High School. While growing up in Santa Barbara, he often frequented the infamous Del Playa Drive, the middle of the party scene of the college town of Isla Vista, where he often found himself in fights with drunk college students. He became a Division I wrestler at California Polytechnic State University, San Luis Obispo and graduated with a Bachelor of Arts Degree in Business/Accounting in 1995. He holds an amateur kickboxing record of 20 wins and 2 losses, with 16 of his wins coming by way of knockout.