LONDON – Undefeated heavyweight world champions Anthony Joshua and Joseph Parker kicked off fight week with a tense faceoff at the sprawling Sky Headquarters outside London as they approach Saturday’s Heavyweight World Championship Unification live on SHOWTIME from Principality Stadium in Cardiff, Wales.

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The British sensation Joshua (20-0, 20 KOs) owns the IBF and WBA titles, while New Zealand’s Parker (24-0, 18 KOs) is the reigning WBO Champion.  The two will meet on Saturday in just the 11th unification in heavyweight history in front of what is expected to be nearly 80,000 boxing fans at the national stadium of Wales.

The blockbuster matchup marks just the second heavyweight championship unification between undefeated world titleholders.  The last fighter to emerge victorious from a matchup of unbeaten heavyweight champions was Mike Tyson in 1987.