Hartwell, who shot a 3-under par 69 on the first day, recorded 14 birdies in the final round for a blemish-free scorecard.
He rattled off five birdies in a row on holes No. 2 through 6 and another five straight on holes No. 8 through 12, before closing out the round with birdies in four of his last five holes.
Hartwell only registered one bogey over the course of two days.
The 58 he posted on Thursday is a new course record at Running Y Ranch. His previous career-best score was a 64.
Davis Hartwell, a 13-year old from Klamath Falls, shot a 58 yesterday in the final round of an OGA Junior Golf Championship played at @Running_Y_Ranch.
— Oregon Golf Association (@OregonGA) July 30, 2021
- Read more: https://t.co/ePS34Uvb3Q#juniorgolf #golf #golflife #growthegame pic.twitter.com/l2Bo7B3OFu
So far in 2021 Hartwell has earned four Boys 12-13 Division wins in the five OGA Junior Major Tournaments for which he has competed.
He took home a division title at the Centennial Junior Championship, an event he shot 13-under par to win by 13 strokes. Hartwell also posted victories at the Central Oregon Junior Championship, the Southern Oregon Junior Championship before the remarkable win at the Klamath Basin Junior.
He also finished as runner-up at the Central Willamette Junior Championship.
Thanks to the Oregon Golf Association for this report.