Brian Castano is officially on the clock. In the wake of an untimely injury forcing a postponement of his March 19 rematch with Jermell Charlo, Argentina's Castano (17-0-2, 12KOs) is now at the mercy of the WBO. The unbeaten junior middleweight titlist has been ordered by the Puerto Rico-based sanctioning body to show cause as to why he should not have to commit to an overdue mandatory title defense versus Australia's Tim Tszyu.
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