Hopkins played for the victorious Llanelli team that played and beat the New Zealand All Blacks at Stradey Park on 31 October 1972. The Scarlets side emerged 9-3 winners of what was a bruising, brutal encounter at a packed Stradey Park with 20,000 supporters. Others to play in the victory included ex Wales Coach Gareth Jenkins and Ray Gravell.
Although he played only 20 minutes for the full international Wales team, Hopkins earned lasting fame in Welsh rugby history due to a notable try against England in 1970.[4] It was unfortunate for him that Gareth Edwards was in possession of the Wales and British Lions scrum-half position at the time.
Hopkins's moment of fame came during the England v. Wales game at Twickenham in 1970.[5] The Wales team were behind on points with twenty minutes to go. The captain, Gareth Edwards, was injured and had to retire from the game. Hopkins came onto the field as a replacement. He soon scored a try, and, after a conversion by J.P.R. Williams, Wales won the game.
He toured with the 1971 Lions to New Zealand and played in ten games against provincial sides.[6] He was an injury replacement for Gareth Edwards in the DunedinTest match, which the Lions won, 9-3.