Watch: Sonny Bill Williams knocks out Barry Hall

Former Aussie Rules player Hall was a hate figure for Ireland fans during International Rules series

SYDNEY, AUSTRALIA - FEBRUARY 07: Quade Cooper of Australia and Sonny Bill Williams of New Zealand share a laugh after the 2016 Sydney Sevens cup final match between Australia and New Zealand at Allianz Stadium on February 7, 2016 in Sydney, Australia. (Photo by Mark Kolbe/Getty Images)

New Zealand rugby legend Sonny Bill Williams knocked out Barry Hall in the first round of their boxing match in Sydney.

36-year-old Williams, who represented New Zealand in both rugby league and rugby union, is trained by Andy Lee and moved his professional record to 9-0.