On the surface, golf is the most individual of sports: a lone player lost in thought and in sole control of the outcome. But at the highest levels, its biggest stars operate more like a Fortune 500 company. Jason Day is the CEO, but behind the scenes an efficient support group is at work.

Closest to Day is his wife, No.1 fan, chef and psychologist, Ellie Day. Colin Swatton, a fellow Aussie who has worked with Day since he was a teenager, is his caddie and swing coach. Among the inner circle: manager Bud Martin, who has been around the game for decades and signed Day when he first turned pro. Day has a medical team, including chief medical officer Jim Bradley, team doctor for the Pittsburgh Steelers; on-call physician Andrew Margolis, in case Day needs mending at a tournament; and family doc Ray Pongonis. There’s also nutritionist Randy Grant; director of Jason Day Performance, Jason Spencer; childcare manager for the Days’ two children, Katie Eason; director of his foundation’s Brighter Days Golf Tournament, Bonnie Upright; financial advisor Jon Koteski of Oakmont Capital; CPA Jeff Jones; and legal adviser Pete Fuscaldo of Leech Tishman Fuscaldo & Lampl.