10. Rich Mueller, 61, El Rio Golf Course, 1979

A lefty from Amphitheater High School, now the director of the Crooked Tree Golf Course, Mueller has shot 62 at Arizona National, 63 at Starr Pass and 63 at Tucson National, but his 9-under 61 at El Rio when he was at Amphi is his career low. “I birdied 18, but had to get up-and-down and didn’t have a shot at an eagle,” he remembers.