Former New Zealand international Sonny Bill Williams takes part in a press conference at the Emirates stadium in London on November 14, 2019 at his unveiling as a player for Rugby Super League team Toronto Woolfpack. (Photo by Isabel Infantes / AFP) (Photo by ISABEL INFANTES/AFP via Getty Images)

The long-awaited confirmation of Sonny Bill Williams' fight against ex-AFL player Barry Hall has finally come, with the bout to take place on Wednesday, March 23.

Williams, who is currently riding an eight-match unbeaten streak, has placed his full focus on boxing and doesn't believe Hall is on his level.

"For the first time in my professional sporting career, I am fully concentrating on boxing," Williams said.

"I know Barry Hall is a very hard man and his debut proved he has a tonne of skill, but he is inexperienced in the ring and nowhere near my class level.

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"This fight against Hall starts the last chapter of my sporting career and I will take this win and move on to further big fights over the next 24-36 months."

Meanwhile, Hall, whose last fight was a 2019 draw with Paul Gallen, believes he has what it takes to not only match Williams, but top him.

"I showed against Paul Gallen that I can go the distance and go hard," Hall said.

"Sonny is a hugely talented individual but has not ever faced anyone of my size or skill. The lad has had everything laid on a silver platter in his boxing career to date.

"Sonny Boy has made a mistake in taking this fight, I intend to finish his boxing career and open up bigger fight opportunities for myself."

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Hall, who captained Sydney to its 2005 premiership triumph over the West Coast Eagles, had never fought professionally before his bout with Gallen.

Williams - clearly the more experienced fighter of the two - will look to increase his unbeaten run to nine matches come late March.