Caddie Line: 2021 3M Open course preview The Caddie Network Staff 3 years ago Jul 23, 2020; Blaine, Minnesota, USA; Bubba Watson and Paul Casey walk to the 2nd hole green during the first round of the 3M Open golf tournament at TPC Twin Cities. Mandatory Credit: David Berding-USA TODAY Sports The 3M Open takes place this week at TPC Twin Cities in Minneapolis, Minnesota. Our resident expert John Rathouz — a veteran caddie of 16 years — breaks down what it will take to come out on top Sunday with this course preview.