UFC 58: USA vs Canada was a mixed martial arts event held by the Ultimate Fighting Championship on March 4, 2006. It was held at the Mandalay Bay Events Center on the Las Vegas Strip in Nevada, and broadcast live on pay-per-view in the United States.

In keeping with the theme of the card, each fight featured an American fighter against a Canadian fighter.

Five of the seven Canadian fighters featured, Icho Larenas, Sam Stout, Mark Hominick, Georges St-Pierre, and David Loiseau, were at the time champions in the Canadian TKO Major League MMA promotion.

The show drew a live gate of $1,758,450. The disclosed fighter payroll for UFC 58 was $207,000.

The final scorecard for "USA VS Canada" was  United States 5,  Canada 3.

This event also featured the return of the lightweight division to the UFC, which had been suspended since UFC 49

Georges St-Pierre: $48,000

Rich Franklin: $32,000

Nathan Marquardt: $30,000

BJ Penn: $25,000

Tom Murphy: $10,000

Mike Swick: $10,000

David Loiseau: $9,000

Spencer Fisher: $8,000

Francisco Santos Miranda, III (born May 24, 1979), better known as Frank Mir, is an American mixed martial artist, as well as a black belt in Brazilian Jiu-Jitsu and Kenpō Karate.

Mir, one of the most accomplished heavyweights in MMA history, is a two time UFC Heavyweight Champion . He currently holds the record for most victories in the heavyweight division of the UFC with 14 and most wins by submission in UFC Heavyweight division history with 8. He is also the only man in UFC history to win a bout by toe hold. As of January 2012 he is ranked the #4 In the ESPN MMA Power Rankings.He holds the distinction of being the first and only man to both knock out and submit MMA legend Antônio Rodrigo Nogueira. Mir is the only person to submit former UFC Heavyweight Champion and NCAA Division I wrestler Brock Lesnar and highly regarded striker Cheick Kongo. Frank Mir has had more fights in the UFC than anyone else currently competing in the heavyweight division.

His father convinced him to begin wrestling, on the basis that it could help him avoid submissions. Mir then began wrestling at Bonanza High School in Las Vegas, Nevada where during his junior year he lost his first nine matches. During his senior year (1998) he went 44–1 and won the state championship. He was also on the school's football team that reached the Southern Zone semifinals in 1997 and where he played as fullback and defensive end. He also took up track and field in 1998 where his discus throw of 177 feet, 10 inches is still a Sunset Regional record.

Alistair Cees Overeem (born May 17, 1980) is a British born Dutch mixed martial artist and kickboxer, signed to the Ultimate Fighting Championship. He is the former Strikeforce Heavyweight Champion, Dream Heavyweight Champion, K-1 World Grand Prix Champion, and made history by being the only fighter in combat sports to hold a world title in both MMA and K-1 kickboxing at the same time. Alistair Overeem is ranked #3 in the heavyweight division.

Overeem was born on (1980-05-17)May 17, 1980, to a Dutch mother and Jamaican father. His parents divorced when he was six years old. His mother, Clair, then moved Alistair and his brother Valentijn to the Netherlands, where Alistair has lived ever since.

As a child, Overeem competed in sports like judo, athletics and basketball. At 15 years of age, his brother Valentijn took him to Chris Dolman's gym to teach him how to defend himself. At first he didn't like to train, but after training with Bas Rutten, Joop Kasteel and others, he eventually learned to enjoy it.

Eddie Alvarez is an American mixed martial artist, and former Bellator Fighting Championships lightweight champion. Alvarez also competes for the Japanese DREAM promotion, and fought once for ProElite's EliteXC promotion. On his way to proclaiming himself the best lightweight outside of the UFC, Alvarez has beaten the likes of Roger Huerta, Josh Neer, Pat Curran, Toby Imada, Shinya Aoki, Joachim Hansen and Tatsuya Kawajiri.

Of Puerto Rican and Irish descent, Alvarez was born and raised in Kensington, Philadelphia, a rough neighborhood with a reputation for violent crimes and an abundance of street narcotics.

Known in MMA for his boxing prowess, Alvarez was a wrestler at Northeast Catholic High School. He was a two-time National Prep All-American, and placed 6th in both 2000 and 2001 at the National Prep School Wrestling Championships in the 145 lb weight class. After high school, Alvarez immediately pursued a professional career in MMA with his first fight coming after only eight months of formal training.

Michael Chandler Jr. (born April 24, 1986 in High Ridge, Missouri) is an American professional mixed martial arts (MMA) fighter fighting in the lightweight division and previously in the welterweight division. He is currently under contract with Bellator Fighting Championships where he is the Bellator Lightweight Champion. He was also the winner of the Bellator Season Four: Lightweight Tournament. He was the 2011 breakthrough fighter of the year and is currently ranked as the #9 lightweight by Sherdog.com.

Chandler was born and raised in High Ridge, Missouri. He was born second of four children to Michael Sr. and Betty Chandler. In high school, Chandler was on the honor roll every term, received three letters in football, and finished second at the Missouri State High School Championships his senior year for wrestling. He was voted the Most Valuable Wrestler during his senior season and was selected to the All-St. Louis Team.

Upon graduating from Northwest High School in 2004, Chandler enrolled at the University of Missouri, walking onto the school's wrestling squad. While at Missouri Chandler was a four-time NCAA qualifier, collected 100 career wins, as well as earning fifth place All-American honors. Chandler earned runner-up honors in the 2008 and 2009 Big 12 Championships and was awarded automatic bids to three of the four NCAA tournaments he competed in. Chandler compiled a 31-15 record against Big 12 opponents and a 100-40 overall record in his four years as a starter. He majored in personal finance management services with a minor in real estate.