Joe Joyce says he’s ready for the biggest fights out there, Oleksandr Usyk or Tyson Fury. Joe Joyce picked up the interim WBO heavyweight title on Saturday in Manchester, stopping Joseph Parker in the 11th round of a really good heavyweight battle between two legitimate contenders. Joyce (15-0, 14 KO) has his sights mainly set on facing Oleksandr Usyk next, as Usyk holds not just the WBO title but also the WBA and IBF belts, but he says he’s also plenty up to take on Tyson Fury, who has the WBC title despite his supposed retirement, which comes with constant…