Anthony Joshua promoter Eddie Hearn says Joseph Parker won't be laughing when he's punched by the big Brit during their boxing world heavyweight title unification fight.

Parker cheekily suggested he would taunt Joshua by smiling at him if he couldn't dent the Kiwi's chin when they clash in Cardiff on March 31st.

Neither fighter has been knocked out during their professional career but Parker's camp have accused Joshua of having a "glass chin".

Hearn warned Parker against laughing in the ring when facing Joshua before more than 70,000 fans at the Principality Stadium.

Joshua, who holds the WBA, IBF AND IBO titles, has won all 20 of his professional fights by knockout but Parker's camp have continued to refer to past knockdowns the 28‑year‑old Brit has suffered in the ring and while sparring.

Parker, the WBO titleholder, has also won all 24 of his professional fights (18 by knockout) but hasn't knocked out an opponent in his last three fights.

Source: Stuff.co