Ryan Stults of Luther finished as state runner-up, only two strokes behind Strathe.
An opening-round score of 77 on Monday doomed Stults.
“I am a little disappointed I didn't start better,” he said.
He bounced back with a 73 on Monday's second 18 holes to get within two strokes of Strathe heading into Tuesday's final round.
Stults shot an even-par 71 on Tuesday, but so did Strathe.
“Even par today was a pretty good round,” Stults said. “I did all I could do.”
The rounds of 71 by Stults and Strathe were the lowest scores in the tourney.
Seminole State College is recruiting Stults to play golf.