Tyrus Hosley buried seven 3-pointers, including the game-winner with two seconds left as Evergreen secured the No. 3 seed to the district tournament.
Evergreen will host Mountain View at 7 p.m. Monday to open district.
Battle Ground rallied from an 18-point second-quarter deficit to tie the game twice late in the fourth quarter.
After the Tigers tied it 61-61 with 16 second to go, the Plainsmen weaved the ball down court before getting it to Hosley, who hit from 25-feet out.
“It was from 25 feet out asnd he had a hand in his face, but he rattled it in,” Battle Ground coach Wes Armstrong said. “He had seven 3s and the majority of those were contested. He just hit some really good shots.”