Playing at the Ellie Mae Classic at TPC Stonebrae in Hayward, he made 12 birdies and six pars in the first round to open a four-shot lead on the field.
"Everything went well. I was driving the ball well. I was making everything. I got the good breaks," the 27-year-old said after capping off his record round by sinking a 10-foot birdie putt at his final hole, the par-five ninth.
"Everything went my way. Even the bad shots you'd get a good bounce and have 15 feet and make that. It was just a blackout round, it really was. Those don't happen too often."
Jaeger's 58 is not an international first, however, after Ryo Ishikawa achieved the feat on the Japan Tour in 2010, becoming the first player to post such a score on any globally-recognised circuit.
(Reporting by Andrew Both in Cary, North Carolina; Editing by John O'Brien)
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