2005–2006 Shaw began his career as a strongman with a win when he entered the Denver's Strongest Man contest in October 2005. He had entered with no formal training. Just seven months later in June 2006, he joined the professional ranks and his successes continued. Shaw won the inaugural
Jón Páll Sigmarsson Classic on November 21, 2010. Shaw won the
Strongman Super Series Swedish Grand Prix and became the 2010 overall Super Series champion on December 18, 2010. This was Shaw's second consecutive overall Super Series championship.
2011–2012 In 2011, Shaw once again participated in the World's Strongest Man competition. Going into the final event, the Atlas Stones, Shaw was tied with two-time champion Zydrunas Savickas. Shaw beat Savickas in the final event, taking 1st place. Shaw also won the 2011 Arnold Strongman Classic, becoming the fourth man to do so (after
Mark Henry, Savickas, and
Derek Poundstone). Doing so, he became the first man to win both the Arnold Strongman Classic and the World's Strongest Man in the same year. However, in March 2012, at the 2012 Arnold Strongman Classic, Shaw suffered a left distal biceps tendon rupture in the first event, the Apollon Wheel,. While he finished the event, he only finished 4th overall, missing out on a podium finish. This injury affected Shaw's performance in the 2012 World's Strongest Man Competition, resulting in him falling out of the podium for the first time since 2009.
2013–2014 In the 2013 World's Strongest Man competition, 13 weeks after surgery to repair his left biceps tendon, Shaw led Savickas into the final event (again the Atlas Stones) and again beat Savickas to win the competition. He broke Savickas' record in the deadlift, lifting 442.5 kg (975.5 lbs). He also won his inaugural national title by winning 2013 America's Strongest Man. In 2014, Shaw placed 2nd overall in the Arnold Strongman Classic and 3rd overall in World's Strongest Man. He won 2014 North America's Strongest Man.
2015–2016 Shaw also won the 2015 and 2016 World's Strongest Man competitions. This made him one of five men to have won four World's Strongest Man competitions, together with
Mariusz Pudzianowski (the only man with five),
Jón Páll Sigmarsson,
Magnús Ver Magnússon and
Žydrūnas Savickas. Shaw also won the 2015 Arnold Strongman Classic competition, repeating his feat of winning both the Arnold Strongman Classic and the World's Strongest Man in the same year. Shaw also won Americas Strongest Man for the second time in 2016.
2017 In 2017, Shaw competed in both the World's Strongest Man and the Arnold Strongman Classic competitions. Shaw won the Arnold Strongman Classic, but later in the year, he finished 3rd at the World's Strongest Man, behind the winner
Eddie Hall and runner-up
Hafþór Júlíus Björnsson.
2018 In March 2018, Shaw competed in the 2018 Arnold Strongman Classic, finishing 2nd place overall with 41.5 points to winner Hafþór Júlíus Björnsson's 46. Shaw secured another podium finish at the 2018 World's Strongest Man after emerging 3rd behind
Björnsson, who won his first World's Strongest Man competition, and runner-up
Mateusz Kieliszkowski. In October 2018, Shaw competed in the inaugural
World's Ultimate Strongman which contained one of the most stacked lineups of all-time. Shaw struggled with some of the events including the deadlift where he had trained with a different bar height and the yoke walk where the stage cracked under the combined weight of Shaw and the yoke, causing him to briefly drop the yoke and increase his time. However he performed well, lifting all the objects in the overhead medley and was separated from leader Björnsson by 5.5 points going into the sixth and final event. In the sixth and final event, the Atlas Stones, Shaw lifted all five stones but this was not enough to surpass Bjornsson, leaving Shaw in second place.
2019 In March 2019, Shaw competed at the 2019 Arnold Strongman Classic. In his third attempt in the first event, the Rogue
elephant bar deadlift, trying to keep up with Björnsson, Shaw tore his left hamstring. While he was able to complete four of the five events, he ultimately withdrew before the final event, finishing in 8th place. He had not finished below 2nd place in his previous six years in this contest. His next competition was the 2019 World's Strongest Man held in June 2019, where he finished in 6th place, falling out of podium position for the first time since 2012. His final event of the year was the World's Ultimate Strongman in Dubai, where he finished in 4th place.
2020 On January 18, 2020, Shaw placed second overall at the Arnold Strongman USA, behind the winner
Martins Licis. As he failed to win the contest, he did not qualify for the 2020 Arnold Strongman Classic for the first time in 11 years. On November 15, 2020, Shaw placed fifth overall at the 2020 World's Strongest Man competition, failing to make the podium. Shaw placed seventh in the Giant's Medley, fifth in the partial deadlift, sixth in the Hercules Hold, and seventh in the Log Ladder. On December 11, 2020, he hosted the first
Shaw Classic competition. Shaw hosted, organized, and paid out the purses for the competition. Rogue provided equipment for the competition with Trifecta announced as a sponsor. Shaw invited an All-Star cast of ten Strongmen to compete including the reigning Worlds Strongest Man
Oleksii Novikov (who finished third.) Shaw would end up winning the competition and forfeiting his winning purse giving the winners share to the rest of the athletes. All ten competitors walked away with a share of the winning pool which included money Shaw invested, GoFundMe donations, and pay-per-view earnings.
2021 In the 2021 World's Strongest Man Competition, Shaw placed 2nd behind Scottish Strongman
Tom Stoltman, his first podium finish since 2018. In the event he qualified for his record 13th WSM final, breaking a tie held by him and
Zydrunas Savickas. All 13 of these finals were consecutive, another record. He also extended his own record by appearing in his 14th consecutive WSM contest, and equaled the record 10 podium finishes of Savickas. Shaw also set a new world record in the
keg toss for height, clearing a height of (his previous record of m was broken by 4 other men in the competition). Brian also finished in 2nd and 7th place at the
Shaw Classic and
Rogue Invitational later that year.
2022 In the 2022 World's Strongest Man Competition, Shaw placed 4th in the final and extended his record for consecutive WSM competitions to 15 and consecutive WSM finals to 14. He was also the runner-up at the 2022 Shaw Classic.
2023 In 2023, he announced that he would compete in two competitions prior to retiring, the World's Strongest Man and the Shaw Classic. Prior to World's Strongest Man, he contracted an infection in his leg requiring hospitalization and IV antibiotics. He recovered in time for his record extending 16th consecutive WSM competition. He competed in group four and finished in second behind Jaco Schoonwinkel. He had to face off against the third place finisher in his group
Rauno Heinla in a stone off and was victorious advancing to his record-extending 15th final. He ended up finishing in 7th place in the final. A new award, the Knaack Tools of the Strongman Award, was also awarded to both Shaw and veteran strongman
Mark Felix. The award was voted on by the athletes to recognize the hardest working athlete in the year's competition. In the 2023 Shaw Classic, his final professional strongman competition, he scored the overall win by seven points over
Mitchell Hooper to become a two-time Shaw Classic champion. ==Competitive record==