Phil Mickelson at The Open: No driver, driving iron, new putter?

“My math is different from anyone else,” Phil Mickelson told reporters ahead of the British Open at Royal Birkdale.

It seems, much like his math was different in 2013 when he unleashed the Phrankenwood, Mickelson’s Open calculations have again returned a different result.

Lefty looks to be scrapping the driver in favor of a Callaway Epic 3-iron bent to 16 degrees, per a Golf Channel report. He will carry a 3-wood this week, presumably a 13.5-degree Callaway GBB Epic Sub Zero with a Project X HZRDUS Yellow 75-gram shaft.

Mickelson has carried an Apex UT 3-iron this year, which he’ll reportedly keep in the bag in addition to the driving iron.

Interestingly, we also spotted Mickelson testing an insert-less putter, deviating from his Odyssey Versa #9 White with a Microhinge Insert.

While he looked to be going back and forth between the milled-faced putter on the putting green, it looks like he continued testing the non-insert putter during his practice round, judging from on-course images like the featured image on the story.

Stories of Mickelson’s equipment tinkering are legion on the PGA Tour. But if this switch up works the same way as his last major pre-Open shakeup, he’ll be holding the Claret Jug.