Anthony Joshua's confidence, ring identity might be tested by late-sub Robert Helenius

Before the failure of a drugs test had denied him his sought-after rematch with Dillian Whyte, Anthony Joshua had spoken like a fighter finally ready to rediscover his identity. On Saturday at London's O2 Arena, however, against Robert Helenius – the late replacement for Whyte – he will confront a significantly different test. It is his confidence – and therefore fighting

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