His best wins were against George Chuvalo, Henry Cooper, Dick Richardson, Uli Ritter, Jack Bodell, Johnny Williams, Joe Bygraves, and Willie Pastrano.
He successfully defended his British Empire (Commonwealth) against Jamaican-born heavyweight Joe Bygraves on 25 November 1957, again winning over fifteen rounds on points.
On 21 February 1958, he unsuccessfully fought for the European heavyweight title against Ingemar Johansson, in Gothenburg, Sweden, losing on a technical knockout in the thirteenth round.
On 24 February 1959, Erskine fought and defeated the talented American boxer Willie Pastrano, who was later (in 1964) to become World light-heavyweight champion.
On 24 June 1959, he fought another Welsh boxer, Dick Richardson in a ten-round bout at Coney Beach Arena, Porthcawl, Wales, and won on points.
On 13 October 1963, he fought the famous German southpaw, Karl Mildenberger, in Dortmund, Germany, and lost the ten-round bout on points.
On 3 March 1964, Erskine fought Jack Bodell, a British champion of the future, and defeated him on points over ten rounds.
He was one of many signatories in a letter to The Times on 17 July 1958 opposing 'the policy of apartheid' in international sport and defending 'the principle of racial equality which is embodied in the Declaration of the Olympic Games'.