If we've learned anything among the world's best golfers this season, it's that no player/caddie relationship is safe.
The latest example? Jason Day. The 2015 PGA Champion, as reported by Golf Channel's George Savaricas, will use friend Luke Reardon as his caddie this week at the BMW Championship instead of Colin Swatton.
Swatton had been Day's caddie since turning pro in 2006 and also doubles as his coach -- a position he'll continue to maintain.
Swatton has been so much more than a caddie and coach for Day. He's also been a father figure to the 10-time Tour winner, who lost his dad at the age of 12.
So far, we don't know if this change is temporary or permanent. We do know it seems to be the en vogue thing to do on Tour this season.
Back in June, Phil Mickelson and Jim "Bones" Mackay -- his caddie for a quarter century -- called it quits and Mickelson put his brother, Tim, on the bag. Mackay, meanwhile, quickly got a gig as an on-course reporter for NBC.
That one -- at least in golf terms -- felt like watching your parents get divorced after years of married bliss. If there was one player/caddie relationship built to last, that was it.
Then a month later, Rory McIlroy called it off with his longtime caddie, J.P. Fitzgerald, just days after praising him for a stern talking to that Fitzgerald gave the former world No. 1 after a rough start to the Open Championship. McIlroy credited the pep talk for his ability to turn things around and wind up finishing T4.
The timing seemed a bit odd given that there was still a World Golf Championships event, a major and the PGA Tour Playoffs for the FedExCup -- where McIlroy was the defending champ -- left to be played. However, we suppose there's never a "good time" to break up.
McIlroy quickly put his best friend, Harry Diamond, on the bag. The duo's best finish in four starts together was in their first week -- a T5 at the WGC-Bridgestone Invitational. They missed the cut in their last start at the Dell Technologies Championship, but admittedly, McIlroy has been struggling with a lingering injury.
Again, we don't know for sure if this will be a permanent change for Day. What we do know, is that when things start to go south, players like to shake things up and it's usually caddies who are the first to go.