The foundation of Rory McIlroy’s Grand Slam was not built at Augusta. It was built on a putting green in Holywood, Northern Ireland, where a boy with a plastic club and a dream found the people who would never leave his side.

Harry Diamond has been on the bag since 2017. Gerry and Rosie McIlroy worked multiple jobs over a decade, with no family holidays, to fund a junior career they believed in completely. When McIlroy missed his putt on 18 at Augusta last year, Diamond steadied him in one sentence. Some things cannot be coached. They can only be earned.

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