An All Black great and Kangaroo legend will let their fists do the talking in the boxing ring tonight - putting an end to a decade long feud.

Sonny Bill Williams and Paul Gallen will mark the end of their sporting careers with the trans-Tasman showdown. But how much is at stake beyond ego? And how much do these fight events draw in?

Newstalk ZB sports journalist Elijah Fa'afiu joined Elliott Smith from Sydney to discuss.

LISTEN ABOVE

See omnystudio.com/listener for privacy information.