Alaina Anderson set the tone early for the Petrolia Lady Pirates.
In the top of the first, the senior belted a 3-run bomb over the left-field fence to put Petrolia on the board. She then promptly provided an encore, smashing another 3-run blast over the scoreboard in left.
Just like that, the Lady Pirates led 6-1.
"It gave us a mental boost," Petrolia senior catcher Jamie Kowalick said.
Seymour scored a run each in the bottom of the each frame. Carol Swindell knocked in Haylee Hoyt in the first, then Hanna Rivers drove in Amy Hollar in the second.
After both teams went scoreless in the third, Anderson received the ultimate sign of respect in the top of the fourth, receiving an intentional walk to load the bases.
The inning went south for Seymour after. Two runs scored on walks, followed by one a wild pitch. Kirsten Kenyon wrapped up the scoring with an RBI-single to drive in Katie Cummings. The lead jumped from 6-2 to 10-2.
Macey Siegert drove in a run in bottom half to make it 10-3, only to have Alaina Anderson knock in her sister Abby with an RBI-double in the top of the fifth, her seventh RBI of the day.
In the top of the sixth, Petrolia added two more runs from RBIs from Allie Ablia and Sidney Mobley to take a 13-3 lead.
Seymour fought back in the bottom half to avoid the run rule. The Lady Panthers put the ball in play, forcing Petrolia mistakes and answering back with four runs to give themselves some life entering the seventh trailing 13-7.
Kenyon drove in Cummings in the top of the seventh to push the lead to 14-7. She finished 4/5 with 2 RBIs.
The deficit proved to be too much for Seymour. Cummings, pitching in late relief for Anderson, ended the game with a strikeout.
"I'm so thrilled for these girls," Petrolia head coach DeDe Gray said. "They've come from adversity after adversity."
Petrolia had lost the last two years in the regional finals and played most of the season with a below .500 record.
"No one saw it coming," Kowalick said. "We proved everybody wrong."
Petrolia will play in the state semifinals on Wednesday morning, either at 9:00 a.m. or noon at McCombs Field at the University of Texas in Austin.