The 2020 US PGA champion Morikawa birdied his first hole to move to four under, two shots behind first-round leader Louis Oosthuizen who was not due out until mid-afternoon.
Finau was playing some of the best golf of the morning starters in overcast and breezy conditions.
His tee shot at the 238-yard third finished 12 inches from the pin for his first birdie of the day and he then chipped in from the back of the fifth green to move to two under.
The same was applicable to Bryson DeChambeau out in the afternoon with the intention of making his golf the talking point after becoming embroiled in a row with his club manufacturers on day one.
After posting a one-over 71, in which he hit just four of 14 fairways, the big-hitting 2020 US Open champion initially blamed his equipment saying “the driver sucks”.
Club manufacturers Cobra – who have designed the driver with a 46-inch shaft and only five degrees of loft specifically for the American with a scientific approach to the sport – did not take kindly to the comments.
Tour operations manager Ben Schomin called them “stupid” and said DeChambeau was “like an eight-year-old that gets mad at you”.
The world number six subsequently apologised for speaking out of turn.
“The comment I made in my post-round interview was very unprofessional. My frustration and emotions over the way I drove the ball boiled over,” DeChambeau wrote on Instagram.
“I sucked today, not my equipment. Cobra and I have worked together for over five years and they are some of the hardest working people in the golf industry and make an incredible product.
“Their team is like family to me, especially Ben Schomin who has been there for me every step of the way since I started my career.
“I deeply regret the words I used earlier. I am relentless in pursuit of improvement and perfection. Part of that causes me to become outwardly frustrated at times.
“With the new speeds I am obtaining, my game is a constant work in progress and so is controlling my emotions.”