He played three rugby union internationals for New Zealand in 1951, before switching codes and joining English club Halifax, for whom he made 188 appearances between 1951 and 1956.
A second five-eighth, Lynch represented Otago and Canterbury at a provincial level, and was a member of the New Zealand national side, the All Blacks, in 1951.
He played ten matches for the All Blacks on their tour of Australia that year, including three internationals, scoring 27 points in all.
[3] Lynch played centre in Halifax's 4–all draw with Warrington in the 1954 Challenge Cup final during the 1953–54 season at Wembley Stadium, London on Saturday 24 April 1954, in front of a crowd of 81,841.
He also played at centre in the 4–8 defeat by Warrington in the replay at Odsal Stadium, Bradford on Wednesday 5 May 1954, in front of a record crowd of 102,575 or more.