Among those who couldn't take advantage was defending champion Jordan Spieth.
Baywatch star and model Kelly Rohrbach got golf fans off their feet on Thursday after posting a clinical birdie at the Pebble Beach Pro-Am on Thursday afternoon in sunny California.
But it's Streelman and Hossler who lead the way after one round following their excellent opening rounds of 65.
Kelly Rorhbach makes a drive at the 3M Celebrity Challenge. When you have a bunch of screws in there and a couple of plates, you've got to be careful about how much reverberation you have running up that collarbone, so I gave it a lot of time to heal.
"I had two chances to win golf tournaments and I didn't", McIlroy said of his performances in Abu Dhabi and Dubai.
Day had five birdies and two bogeys in his opening 69 at SpyGlass Hill course, three-under par, to sit in a tie for 31st after the first round.
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American Streelman and compatriot Hossler, a PGA Tour rookie, shared the top spot after both finishing on seven-under 65 on different golf courses.
Northern Ireland's world number eight Rory McIlroy had six birdies and two bogeys in his four-under 68 at Spyglass.
However, when Day's comment about McIlroy's desire was put to the Holywood man during his pre-tournament press conference, the 28-year-old responded brushed off any suggestions that his enthusiasm has been dimmed by a winless 2017 during which his progress was hampered by injury and inconsistency.
Recent Australian victor Cameron Davis (73, Pebble Beach) and Stuart Appleby (73, Spyglass) are one over, while Sydney native Matt Jones (74, Pebble Beach) is two over.
"It was a nice way to finish after not getting off to a great start", said Mickelson. I was on the back end of the U.S. Open, I finished second there and I lost by eight.