The fight is adjudged a draw by the three judges and Harrison just manages to hang on to his title - while Polo loses a fourth world-title tilt in controversial circumstances.

JUDGES' SCORECARDS: 116-113 (Polo) 115-113 (Harrison) 114-114

ROUND TWELVE: Harrison comes out with all guns blazing but looks almost spent. Polo continues to pick Harrison off with his jab and turn most of the Scot's swings into air-shots. Polo goes up at the final bell and appears to have done enough to win the fight.

ROUND ELEVEN: Polo comes out firing and has a groggy-looking Harrison in trouble with a sharp combination. Harrison's eye is in a terrible state and has closed up almost completely. The Scot lands with a right in the dying stages but a fresh-looking Polo takes the round.

ROUND TEN: Polo still looks confident while Harrison looks short of ideas as he stalks the sprightly challenger round the ring. Harrison now needs two big rounds to make sure of the win.

ROUND NINE: Both fighters look tired and are drawing from their reserves. Harrison continues to look ragged while Polo looks unflappable and absorbs another crashing right hand from the champion with 30 seconds to go.

ROUND EIGHT: The champion looks slightly disorientated as Polo continues to control things from range with his jab. Harrison is still unable to get inside and must come on strong to make sure of the win.

ROUND SEVEN: Harrison appears to have lost his snap while Polo looks rejuvenated. The champion is taking more punches than before and is unable to get near Polo - but finishes with a good right-left combination.

ROUND SIX: Polo is more positive while Harrison appears to be taking a breather after the exertions of the previous round. The Colombian's round for sure.

ROUND FIVE: Harrison stiffens Polo with a big right hand and follows up with more of the same. Again Polo soaks up the assault - but Harrison walks the round.

ROUND FOUR: Harrison begins to harry Polo more, putting together shots in bunches, and finishes the round with some useful combinations to leave Polo looking flustered.

ROUND THREE: Harrison starts to put some punches together and lands with a thudding right cross. But Polo keeps the Scot at bay for most of the round with his jab.

ROUND TWO: Harrison continues coming forward and landing with right hands but Polo looks comfortable boxing off the back foot. Encouragingly, Harrison's cut appears to have been stemmed.