Jason Day is an Australian professional golfer, PGA Tour member, and winner of the 2015 PGA Championship. He is a former world number one in the World Golf Ranking, having first achieved the ranking in September 2015

As an amateur, Day was twice awarded the Australian Junior Order of Merit. He finished seventh and was the leading amateur at the Queensland Open. Day won the Australian Boys’ Amateur in 2004. His amateur success extended to the United States, where he won the Boys 15–17 division at the 2004 Callaway World Junior Championship and was runner-up in the 2005 Porter Cup.

Jason Day’s illness: What disease does Jason Day have? Does Jason Day have lung cancer?

Jason Day does not have any kind of disease, However, Dening Day raised Jason as a single mother after his dad died from stomach cancer when Jason was only 12.

Dening was first diagnosed with stage 4 non-small-cell lung cancer in 2017, and Jason emotionally broke down about what was happening during a press conference at the WGC-Dell Match Play Championship.