Mathew "Mat" Fraser (born 1990) is an American professional CrossFit athlete known for winning the 2016, 2017, 2018, and 2019 CrossFit Games after taking second place at the 2014 and 2015 CrossFit Games. After a strong performance in 2014, and the retirement of 4-time defending champion Rich Froning Jr., he was a favorite to win in 2015, but was edged out in the final event by Ben Smith.