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Anthony Joshua (right) lands a punch on Andy Ruiz Jr (right) in the WBA, IBF, WBO and IBO Heavyweight World Championships title fight at Madison Square Garden, New York. (Photo by Nick Potts/PA Images via Getty Images)

Anthony Joshua (right) lands a punch on Andy Ruiz Jr (right) in the WBA, IBF, WBO and IBO Heavyweight World Championships title fight at Madison Square Garden, New York. (Photo by Nick Potts/PA Images via Getty Images)

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Anthony Joshua (left) in action against Andy Ruiz Jr in the WBA, IBF, WBO and IBO Heavyweight World Championships title fight at Madison Square Garden, New York. (Photo by Nick Potts/PA Images via Getty Images)

Anthony Joshua (left) in action against Andy Ruiz Jr in the WBA, IBF, WBO and IBO Heavyweight World Championships title fight at Madison Square Garden, New York. (Photo by Nick Potts/PA Images via Getty Images)

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Heavyweight world champion Anthony Joshua from England looks on during a workout at Brookfield Place in the Financial District of New York on May 28, 2019, on fight week as he prepares for his fight against Andy Ruiz Jr. at Madison Square Garden in New York on June 1, 2019 (Photo by TIMOTHY A. CLARY / AFP) (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)

Heavyweight world champion Anthony Joshua from England looks on during a workout at Brookfield Place in the Financial District of New York on May 28, 2019, on fight week as he prepares for his fight against  Andy Ruiz Jr. at Madison Square Garden in New York on June 1, 2019 (Photo by TIMOTHY A. CLARY / AFP)        (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)

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Heavyweight world champion Anthony Joshua from England gestures during a workout at Brookfield Place in the Financial District of New York May 28, 2019, on fight week as he prepares for his fight against Andy Ruiz Jr. at Madison Square Garden in New York June 1, 2019 (Photo by TIMOTHY A. CLARY / AFP) (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)

Heavyweight world champion Anthony Joshua from England gestures during a workout at Brookfield Place in the Financial District of New York May 28, 2019, on fight week as he prepares for his fight against  Andy Ruiz Jr. at Madison Square Garden in New York June 1, 2019 (Photo by TIMOTHY A. CLARY / AFP)        (Photo credit should read TIMOTHY A. CLARY/AFP/Getty Images)