Dustin Johnson wins in Ohio after Jason Day collapses

Dustin Johnson shot a four-under-par 66 to win the WGC Bridgestone Invitational after world number one Jason Day endured a torrid finish.

The Australian went into the final round tying with Scott Piercy at the top of the leaderboard but finished three behind US Open winner Johnson after a bogey on 15 and a double on 16.

American Piercy finished in outright second after a birdie on 18.

Jordan Spieth shot a three-under 67 to finish tied for fourth.

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