Fraser James Macgregor Brown's most recent international outing, before being called up as an injury replacement to Scotland's 2013 summer tour to South Africa, was with Scotland Club International to Bourgoin-Jallieu, where the side faced their French counterparts in February 2013. He made his full Scotland debut late in the second-half of the final match of the quadrangular tournament, the victory over Italy.
His first Scotland appearance at BT Murrayfield came in the second-half of the 2014 viagogo Autumn Test against New Zealand.
He led Scotland under-20 to an 18-17 victory against Wales at McDiarmid Park, Perth, on the opening day of the 2009 6 Nations, but because of injury in that match he missed the age group's other matches in that programme. He returned to the under-20 squad for the IRB Junior World Championship in Japan in May that year, captaining the Scots against Samoa and Japan.
Fraser was Merchiston Castle School captain in 2006/07 and played for Scotland in the Six Nations’ under-18 festival in the Glasgow area in April that season. He made his under-20 international debut in February 2008, playing as a replacement in the Falkirk match in which Scotland opened their campaign in the age group’s 6 Nations, and his first start followed against England at Falkirk in March: he played in all five matches in that championship, starting in two.
He recently signed with Glasgow Warriors for season 2013/14 having returned to rugby with Heriot's after a period out of the game through injury.