* Becomes first Scott to win a WGC event * Willett fires 62, turns heat on Race to Dubai leader McIlroy (Adds details, quotes) SHANGHAI, Nov 8 (Reuters) - Russell Knox fired a final round four-under-par 68 to win the WGC-HSBC Champions event on his World Golf Championships debut on Sunday, the Scot finishing two shots clear of Kevin Kisner at the Sheshan International Golf Club. The only player not to complete his third round in fading light on Saturday, Knox returned to the course early on Sunday and birdied the par-five 18th to join American Kisner at the top of the leaderboard after 54 holes. More...