Jordan Spieth relies heavily on caddie Michael Greller

Jordan Spieth leaned more on his caddie’s words at the British Open.

“This is as much mine as it is his,” Spieth said as he clutched the silver claret jug.

Greller still had to work out some new math at the most critical juncture of the final round at Royal Birkdale.

Spieth was hitting his third shot from the driving range and couldn’t see any part of the par-4 13th hole.

How Greller, the former math teacher from the Seattle area, stumbled into a job for golf’s hottest property remains an amazing tale.

Savage’s golf instructor in Louisville, Ky., was Mike Thomas, the head pro at Harmony Landing and father of a teenager, Justin Thomas.

With some trepidation, Greller left his job as a math teacher to work for a 19-year-old who didn’t have a tour card.