"I believe in the miracles and the power of prayer, so it would mean the world to me, my band and Gregg's family if you would please keep him in your prayers, " Pickler wrote.

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"When you're number one in the world, the smaller fights don't mean anything so you're not going to do the proper training and eat the right food and do the right things, " said McCullough, a former bantamweight world champion.

BBC: Cook warns confident rival Arthur