Which current heavyweight boxer out of all these current top heavyweight boxers will be Anthony Joshua's most challenging / toughest opponent today?
1) Alexander Povetkin
2) David Haye
3) Deontay Wilder
4) Jarrell Miller
5) Joseph Parker
6) Kubrat Pulev
7) Luis Ortiz
1) Alexander Povetkin
2) David Haye
3) Deontay Wilder
4) Jarrell Miller
5) Joseph Parker
6) Kubrat Pulev
7) Luis Ortiz
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