Jason Day’s collapse allows Dustin Johnson in for WGC win

Johnson won the WGC-Bridgestone Invitational after Day's late collapse.

Dustin Johnson won the WGC-Bridgestone Invitational after Jason Day's late collapse on Sunday.

The US Open champion hit a four-under-par final round of 66 to chase down world number one Day and win by one shot in Ohio - his first tournament since his maiden major win last month.