Mickelson is at 13-under 127 at the midway point.
He was two shots up on Mackenzie Hughes, who shot a first-round 60 and was playing Friday afternoon.
Mickelson is playing his first event since reaching the milestone birthday on June 16. It is the third tournament to take place since the PGA Tour resumed play earlier this month, following the Charles Schwab Challenge in Fort Worth, Texas, and the RBC Heritage in Hilton Head, S.C.
Koepka, 30, said that he made a decision to withdraw to protect his fellow competitors and everyone else involved in the Travelers Championship this week. He recorded three consecutive birdies on Nos.
Gordon, a 23-year-old Vanderbilt graduate playing his fourth PGA Tour event on a sponsor's exemption, is 12-under 128 after 36 holes.
One-under through nine holes after three birdies and two bogeys, he made just one birdie on the back nine. He started on the back nine and shot 30 and followed up with a 32 on his final nine holes. His positive test was taken Tuesday. I gave myself a lot of looks.
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The broad-based S&P 500 fell 0.7 per cent to 3,060.82, while the tech-rich Nasdaq Composite Index shed 0.8 per cent to 9,939.71. Hospitalizations and cases have hit new highs in California, Florida and Texas, which is suspending its aggressive reopening.
Gordon birdied eight of his first 11 holes while soaring up the leaderboard. The three-time PGA Tour winner's most recent title came at the Mayakoba Golf Classic in Mexico last November.
As for McIlroy, he was off a shade in all departments in following his opening 63 with a 68 but, at just four off the pace, there was no real damage done.
"I kind of joked walking off there that 59 wasn't even the record because of Jim's 58", Hughes said. "I've done it at home a bunch".
During Thursday's opening round, Stuard hit 12 of 14 fairways and 15 of 18 greens in regulation to finish with a 5-under-par 65.
McCarthy said he felt exhausted after posting a three-under 67 in the opening round. I woke up in the middle of the night feeling achy and sore, and figured that something was wrong, and that I had better get tested before I went to the course'.
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Le nombre d'employés affectés par cette décision n'était pas disponible immédiatement. Cette charge sera inscrite aux comptes du trimestre en cours (clos le 30 juin).
"I guess, if I had have been able to sneak a couple more over the last few holes, get to 14 and then all of a sudden you feel like you're right in it".
McCarthy must self-isolate for at least 10 days, per tour protocols.
Cauley, who opened with a 69, had two negative tests on Friday.
World number five Webb Simpson, fresh off a win in SC, will sit out as a family member tested positive while Koepka's brother Chase, who qualified on Monday, withdrew as he played a practice round this week with Brooks and McDowell.
World No. 4 Koepka withdrew after his caddie tested positive for Covid-19, and Simpson, who won last week's RBC Heritage, dropped out of an "abundance of caution", PGA Tour Commissioner Jay Monahan said in a news conference Wednesday. Brooks Koepka's brother, Chase, also exited in a precautionary move. Simpson cited the positive test of a family member.
Collin Morikawa shot a 1-over 71 on Friday, and he missed the cut at 3-over 143. Only Tiger Woods' 25-event streak was longer since 1990.
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