Mike Fetchick

He won the 1956 Western Open at The Presidio in San Francisco, California in an 18-hole playoff over Doug Ford, Jay Hebert and Don January.

It's generally conceded by golf historians that Fetchick's victory over the sports top stars resulted in a demotion for the Western Open below the other majors.

[1] His best finish in an event considered to be one of four modern major championships was T13 at the 1957 U.S.

[2] Prior to Scott Hoch winning in 2019 at the age of 63 years and 5 months, Fetchick held the Champions Tour record for the oldest winner (1985 Hilton Head Seniors International on his 63rd birthday), and the longest time between his last PGA Tour victory and his first Champions Tour victory: 28 years, 9 months and 27 days.

Fetchick also finished T-2 (playoff loss) at the 1990 NYNEX Commemorative at age 67.