London, August 12: Jason Day is searching for a new caddie after he elected to part company with Steve Williams.
Regarded as the world's most successful caddie, Williams has worked alongside the likes of Peter Thomson, Greg Norman and Tiger Woods - whose bag he was on for 13 major victories between 1999 and 2011.
Williams had caddied for Day in six tournaments since June's US Open, with the former world number one missing the cut in two of them, including the Open Championship, and securing just one top-10 result.
Day has now decided to end his spell with the 55-year-old, a decision he says was not taken lightly.
"Parting with Steve was a mutual decision and not an easy one to make," Day told AAP.
"He is the ultimate pro; it was a real learning experience being exposed to a caddie who has achieved what Steve has. He has worked with the best."
Day, whose preference to use analytical data seemingly clashed with Williams' more traditional approach, added: "It was a disconnect of old school and new school.
"Steve has become a friend and I have a lot of respect for him. I thank Steve for everything he taught me."
David Lutterus will caddie for Day at the upcoming BMW Championship. The Australian is 50th on the FedEx Cup standings and will need a strong result in order to qualify for the season-ending Tour Championship.
Williams was previously reported to have been the highest-paid sportsperson in New Zealand when he was carrying Woods' bag.