Both players posted five birdies and two bogeys around the TPC Avenel at Potomac layout to trail American duo Andrew Landry and JJ Spaun who share the lead at 7-under.
Leishman played in the company of tournament host and former World Number One Tiger Woods and more than held his own as the 14-time major winner again struggled with his game.
Woods made an ugly double bogey at the par-4 6thhole after finding a hazard off the tee but clawed both shots back late with birdies at 14 and 16 to sign for an even par 70 and a share of 48thposition.
Ogilvy and Leishman are the standouts among the Australians in the field with Cameron Percy next best at 1-under and T34 while Aaron Baddeley is alongside Woods at even par.
Matt Jones (+2) and Rod Pampling (+4) both have work to do if they are to play the weekend, Jones 92ndand Pampling outside the top 100.
Spaun and Landry were both bogey free in their rounds of 63 and hold a one stroke advantage over former FedEx Cup winner Billy Horschel and another American, Andrew Putnam.
There are 33 players within five strokes of the lead on a course that saw more than a third of the 120 man field return scores in red figures on day one.
Woods was, as always, the centre of attention particularly after putting a new putter in play for the opening round.
The 42-year-old has used the same Scotty Cameron flatstick for the bulk of his career, including 13 of his 14 majors, but switched to a mallet style TaylorMade putter Wednesday evening.
Asked about the move he said the new putter had grooves in the face to get the ball rolling quicker which works both on the greens at Avenel, which he described as slow, and also with an eye to the upcoming Open Championship at Carnoustie.
This is why @MarcLeish is one of the best putters on TOUR.June 28, 2018
“I’ve always struggled with greens a little on the slower side,” he said, “and these greens aren’t very quick right now and they won’t be quick in three weeks’ time, either.
He suggested the switch was unlikely to be permanent.
“I picked up my putter and it just didn’t feel right, wasn’t looking right so time for it to sit on the bench for a little bit and then I’m sure it will come back eventually,” he said.
“Just one of those things.”
Woods tipped his hat to playing partner Leishman whose 3-under effort came despite a poor day with the driver.
The Victorian hit just three fairways for the day but still managed to find 13 greens.
“This course is tough,” Woods said. “It penalises you - except for Leish today.
“He hit three fairways and shoots 3 under. That’s hard to do on this place.”
KIERAN PRATT SHOWS HOW TO PLAY THE HIGH, SOFT BUNKER SHOT:
Want video tips delivered straight to your inbox? Subscribe to iseekgolf.com newsletters.