Junior Kevin Morales stuck the ball in the net as the sixth man in the shoot-out line-up, after the Pirates missed on their first extra turn.
The Owls scored in the second minute of the match, with senior Ben Valencia getting his team-high eighth goal of the season on a penalty kick, but were then shut out for the remainder of the 80-minute regulation time and two 10-minute overtime periods.
That was a herculean feat by Boonville junior goalkeeper Nathan Green, who came up with 12 saves -- seven on second-half attempts by sophomore Isai Trujillo -- to keep his team in contention. The Pirates tied the match with 11 minutes remaining in regulation on a breakaway by sophomore Tyler Drew.
Each team made three kicks during the shoot-out. Valencia, Trujillo and senior Wilber Palma scored for the Owls, while seniors Josh Vollmer and Eric Warren and sophomore Nolan Shikles connected for Boonville (1-4, 0-3 NCMC).
Marshall (3-3, 2-1) will be at home Friday to take on Hannibal.
The Marshall girls' tennis team remained undefeated Tuesday with a 6-3 non-conference decision over visiting Helias.
The Lady Owls won four singles matches behind senior Stephanie Markes (10-3) and juniors Payton Beeler (10-5), Amanda Harrelson (10-7) and Idalia Aguilar (10-4). The Lady Crusaders (2-3) got their victories from freshman No. 1 Ashley Dowden (10-3) and junior No. 3 Casey Clogston (10-7).
"Helias tested us at many positions," noted MHS head coach Susan Carney. "This will make us stronger and build up our stamina."
Dowden and sophomore Becca Shelton won the No. 1 doubles tilt, 10-7, but Marshall came back with wins by freshman Taylor Crawford and Beeler at No. 2 (10-5) and Aguilar and senior Sam Huston at No. 3 (10-6).
"We're playing well, but we're young and have so much room to get better," Carney said about her 8-0 Lady Owls, who will host the annual Marshall Tournament on Saturday.
INDEPENDENCE -- Marshall freshman Jesse Corkill medaled in two events during his first varsity swim meet Saturday.
Corkill finished 10th out of 51 entries in the 50-yard freestyle (24.29) seconds and 12th out of 36 in the 100-yard butterfly (1:01.51) at the Independence Invitational.
The Owls also got a nice showing from sophomore Wathal Kays, who cut 3.69 seconds from his best time of a year ago in the 50 free (24.29) and 4.62 seconds off his personal record in the 100 free (1:02.60).
With junior Ben Corkill and freshman Seth Layton joining the other two, Marshall placed 18th in both the 200 medley relay (2:24.50) and 200 free relay (2:07.31).
The Owls will return to the metro area Saturday for the Park Hill Invitational.
GRAIN VALLEY -- The Marshall volleyball team battled unbeaten Grain Valley past the limit Tuesday, but didn't have much left over for the second set during a 28-26, 25-8 non-conference road loss.
The Lady Owls were limited to 10 kills, half their per-game average, with freshman Abbie Lemmons leading the team with four.
Sophomore Olivia Haug had six of Marshall's 16 digs and junior Karson Heying knocked down two shots and blocked a pair. Sophomore Allie Lemmons cleanly received 17 of 18 serves which came her way.
The Lady Eagles (4-0) allowed only one ace, by junior Analee Tucker.
The Lady Owls (3-6-1) will be at home Thursday to face Carrollton.