Phil Mickelson has agreed to a "mutual split" with longtime caddie Jim "Bones" Mackay, according to Bob Harig of ESPN.
The duo had been together for 25 years, including 41 of Mickelson's 42 career wins on the PGA Tour, before splitting up Tuesday.
Mickelson's younger brother, Tim, will take over as his caddie.
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This article will be updated to provide more information on this story as it becomes available.