The Raiders left 25 men on base.
Three Rivers was swept by Jefferson 7-3 in the opener and 12-4 in the nightcap Sunday as Jefferson also swept the four-game series.
Three Rivers stranded nine in the opener, including four in scoring position. Things worsened in the nightcap with 16 left on base. The Raiders left the bases loaded four times.
Three Rivers (1-5, 0-4 Region XVI) had five hits in each game and benefitted from loads of walks.
The Viking pitching staff walked seven in the opener and 14 in the nightcap. Of those 25 stranded Raiders, 18 were walked. In the second, third and ninth innings of the nightcap, the Raiders stranded the bases loaded and all three were walked.
Three Rivers took the early lead in the opener after Reece Reading singled in Garyn Stewart and Ryan Hunter in the first inning.
Jefferson (11-2-1, 4-0 Region XVI) nearly batted around in the second and took a 4-2 lead thanks to two-out doubles by Matt Turino and Nick Hagedorn.
Raul Elguezabal had a solo home run in the third and the Vikings added a pair of runs in the fifth.
Matt Robbins had a solo home urn for Three Rivers in the sixth.
Stewart was 2 for 4 with a run for the Raiders and was the only person with multiple hits.
Quentin Bowling started and pitched three innings in the loss. He allowed four hits and two walks with two strikeouts.
Hunter Gautreaux, Parker Dent and Bryce Alcorn all pitched less than two innings in relief. Alcorn struck out all four batters he faced.
Jefferson's Joey Polak had four home runs in the nightcap and finished with six RBIs.
His first two home runs in the first and third innings contributed half of Jefferson's 6-0 lead going into the bottom of the third.
Preston Hart and Stewart reached and scored in the third for the Raiders. Three Rivers added two unearned runs in the seventh inning, and was trailing 9-4 going into the eighth.
Hart was 3 for 6 with a run and Drew Evans was 2 for 4. Stewart, batting second, was walked five times and stranded four times. He saw 27 pitches in six plate appearances.
Beau Burson started and pitched 2 2/3 innings in the loss. He allowed nine hits and a walk with four strikeouts.