Matsuyama maintains one-shot lead over Morikawa on low-scoring day at Sentry
Morikawa also posted a 62, his featuring nine birdies and an eagle.
With the winds that so often buffet the Plantation Course again largely absent, five players posted rounds of 10-under or better.
Matsuyama's gave him a 54-hole score of 192 -- one stroke better than the previous 54-hole tournament record.
Japan's Matsuyama, the 2021 Masters champion, got things going with a run of four straight birdies from the third through the sixth. He rolled in a 58-foot birdie putt at the par-five ninth to make the turn level with Morikawa.