Phil Mickelson is optimistic his wife's breast cancer has been caught early by doctors.
Mickelson withdrew from the PGA Tour indefinitely last week to be be with his wife while she undergoes treatment.
Amy Mickelson underwent a number of tests in recent days and now she and her husband are waiting to hear the outcome.
"We have a wonderful team of doctors helping us, and it is believed that we caught this early," Mickelson wrote on his website.
"We are anxiously waiting for a number of test results that will help guide us in the best possible direction."
He added: "Amy is such a supportive and loving life partner.
"She has always put me and our family first. Now it's time for her and her health to come first as we face this challenge together."
The golfing community has been quick to show support to the couple, with the likes of John Daly and Rory Sabbatini donning pink clothing at recent events, while a number of players have worn pink ribbons.
A "Pink Out" is also planned for this Saturday at the Crowne Plaza Invitational at Colonial, after the US PGA Tour Wives Association asked players and their wives to wear pink clothing to show support.
"It is hard to describe how much the outpouring of support has meant to us," Mickelson added.
"When we heard about the Tour Wives, PGA Tour and the Crowne Plaza Invitational at Colonial organising the 'Pink Out', we both had tears rolling down our faces.
"This is such an incredibly thoughtful gesture, not only for Amy, but for the 200,000 women who are diagnosed with breast cancer each year."
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