Matsuyama, who was the second-round chief, could not shake Morikawa, who additionally shot 62 within the PGA Tour season opener at The Plantation Course in Kapalua, Hawaii.
Matsuyama, at 27-under going into Sunday’s remaining spherical, and Morikawa had been tied on the flip. Matsuyama had birdies on 4 of the final 5 holes.
Belgium’s Thomas Detry is in third at 22-under after his 65.
A 62 for South Korea’s Sunjae Im moved him into fourth at 21-under. His spherical included an eagle on the par-5 fifth gap.
England’s Harry Hall (66) sits in fifth place at 20-under par.
Max Greyserman made a giant transfer by capturing 63 to maneuver to 19-under for the event. He performed a bogey-free spherical and is tied for sixth place with Will Zalatoris (65) and first-round chief Tom Hoge (68).