Mr Watson (11/4f) landed a notable gamble in the Steel Plate And Sections Handicap Hurdle at Cheltenham.
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Tony McCoy had to sweat down to close to his lowest riding weight in order to make the 10-3 in the closing handicap hurdle and that hadn't escaped the betting public who had backed him down to favouritism during the morning.
McCoy sent him out to the front from the moment the tape went up and he always appeared to be travelling strongly for the Champion Jockey.
Kings Lad threw down a strong challenge at the last but Mr Watson responded to his riders' urgings and readily saw off the eventual runner-up by four and a half lengths with a further two and a quarter back to Quaddick Lake in third.
It was a double on the card for the jockey following the earlier success of At Fishers Cross.
Winning trainer Jonjo O'Neill said: "He has been a lot better since we put a hood on him and changed his bit. It depends on what there is for him now, but he might get two and a half (miles)."