Rory McIlroy: I split with caddie JP Fitzgerald to preserve our friendship

World number four Rory McIlroy has revealed he split from JP Fitzgerald because he was increasingly taking out his frustrations on his caddie of 10 years.

The pair worked together during all four of McIlroy's major championship victories, but the last of those was in 2014 and McIlroy has endured a winless, injury-plagued season in 2017.