LAKE BUENA VISTA, Florida — Tyler Herro should still be in college. He's not, but is still a student.

He carries a red spiral-bound notebook with him at all times, jotting down notes when things pop into his head. What worked, what didn't, where he thinks he can get better and how he's feeling after a game.

"It helps me get locked in, helps me focus," Herro said.

Whatever he read on Wednesday night (Thursday, Manila time) helped him put together the game of his life — and carry the Miami Heat a win away from the NBA Finals. The 20-year-old Herro scored a Heat rookie-record 37 points and the Heat beat the Boston Celtics, 112-109, on Wednesday night (Thursday, Manila time) in Game Four of the Eastern Conference finals.

"He has a great competitive humility about him," Heat coach Erik Spoelstra said. "He has a confidence. He has a fearlessness that is uncommon. But he's humble enough to work, to be coachable, to take the mentorship from the veteran players that we have on our team, and he just continues to gain more confidence as we go."