Jason Day says his mother's lung cancer surgery in Ohio has gone well.
In a text message delivered by his agent Friday, Day said his mother is resting comfortably and that doctors are optimistic about her recovery.
Dening Day was diagnosed at the start of the year in Australia, and the initial prognosis was that she had 12 months to live.
Jason Day brought his mother to Ohio for more tests, and the surgery was performed at The James Cancer Institute at the Ohio State University.
"Emotionally, it's been wearing on me for a while.