[5] Broadhurst represented Canterbury, the South Island and New Zealand before moving overseas to play for the Manly-Warringah Sea Eagles, Illawarra Steelers and Hull Kingston Rovers.

One of the most memorable incidents in his career was his brawl with Newtown Jets player Steve Bowden during the minor semi-final match of the 1981 NSWRFL season.

in the 1984 Yorkshire Cup Final during the 1984–85 season at Boothferry Park, Kingston upon Hull, on Saturday 27 October 1984.

in the 1984–85 John Player Special Trophy Final during the 1984–85 season at Boothferry Park, Kingston upon Hull on Saturday 26 January 1985.

[7] Since 2018, the Manly Warringah Sea Eagles and the New Zealand Warriors have played for the Broadhurst-Shelford trophy, named for Mark Broadhurst and the late Kiwis prop Adrian Shelford.