Calvin Sun became an AGA pro through the second AGA Pro Qualification Tournament, which was held in 2014. Prior to becoming pro, Calvin was one of the most dominant youth players in AGA history, winning the US Youth Go Championship and representing the US in the World Youth Go Championship seven times as well as winning the Redmond Cup three times. He has also represented the US at the World Mind Sports Games in 2008 and won numerous other US tournaments. Currently, Calvin is also studying optometry at the Illinois College of Optometry.