The most competitive contest and the only one that could be remotely termed an upset was the final contest of the evening as No. 9 Scott County Central sneaked past No. 8 Notre Dame 76-71 in overtime.
In another competitive matchup, No. 11 Delta extended No. 6 Advance to the wire before succumbing in a four-point loss.
The narrowest margin of victory in the other six first-round games was 32 points.
Defending champion Jackson began a series of romps by the top four seeds with a demolition of Chaffee.
Top-seeded Jackson (9-0) jumped out to an 18-2 lead after one quarter and was never headed against No. 16 Chaffee (2-4). Eleven players scored for the Indians, led by Jack Puisis and Ryan Mirly with 14 points apiece. Ryan Leet added 10 points.
No player scored more than five points for the Red Devils. The Indians, ahead 39-8 at halftime and 63-17 after three quarter, blanked the Red Devils in the final period.
Jackson meets Scott Central at 4:30 p.m. today.
In the battle of Bluejays, Charleston (5-6) got double-digit scoring from four players to cruise past Oak Ridge.
Charleston led 22-9 after one quarter and 41-21 at halftime. Sophomore Justin Clark led Charleston with 18 points, while teammates Ashton Farmer and Shawn Sherrell had 14 apiece and Jamarcus Williams added 12.
Oak Ridge (1-7) got 21 points from Austin Hahs and 13 from Austin Morrison.
Charleston and Kelly face off at 6 p.m. today.
Scott City 78, Oran 46
Mark Dannenmueller, averaging more than 30 points per game, poured in 36 as third-seeded Scott City knocked off No. 14 Oran.
The Rams (4-3), who lead 49-25 at halftime, also got 11 points from Alex King.
The Eagles (0-6) were paced by Steven Mock with 18 points and Ryan Bouge with 13.
Scott City earns a rematch with Advance, an 83-71 winner in a Dec. 17th regular season game, at 7:30 today.
Cape Girardeau Central piled up a 36-13 halftime lead as the fourth-seeded Tigers rolled past No. 13 Leopold. Eli Harris was the only player for Central (4-4) to reach double figures as he scored 18 points.
No player had more than six points for the Wildcats (2-6). Cape Central and Bell City tangle at 9 p.m. today.
Bell City (6-2) routed the Cardinals 72-31 with a game-high 21 points coming from freshman D.D. Gillespie.
Gillespie scored Bell City's first 11 points, and Bell City led by as much as 17 points before finishing the first quarter with a 26-11 lead.
Jeff Liggins added 14 points for the Cubs and Blaine Stewart scored 11. Cody McCraw led the Cardinals (3-5) with 13 points.
The Hornets trailed by a point, 29-28, at halftime but used a big third quarter to take control.
Delta led 39-38 midway through the third period, but Advance used a 9-0 run to go ahead 47-39 and led 51-42 entering the fourth quarter.
The Bobcats hung tough for the entire fourth quarter and trailed by just three points in the late going before the Hornets sealed the victory.
Advance, which improved to 6-1, was led in scoring by Jeremy Limbaugh with 16 points, including 12 in the second half. Daryl Wade added 14 points.
Kevin Bartels poured in 29 points for the Bobcats (3-3). Brent Menz had 13.
For one half of its game with Kelly, Meadow Heights appeared to have upset on its mind.
A 24-0 run by Kelly to start the third quickly put that notion to rest, expanding a 45-40 halftime lead into a 69-40 lead with 1:30 left in the quarter.
An important factor for the Hawks was the play of their bench. Kelly was able to go deep into its bench, giving its main players plenty of breathers without a major drop in play.
Kelly had 10 players in the scoring column, with three players in double figures. "Offensively they only go seven deep. We thought we could wear them down," Kelly coach Cory Johnson said.
Kendal Deason led the Hawks (5-3) with 24 points, including four 3-pointers. Kent Deason added 14 points, and Michael Glastetter had 12.
Heath Fulton led Meadow Heights (5-2) with 14 points, Terry Wagner had 11 and Anthony Bollinger scored 10.
Scott County Central slipped past Notre Dame in overtime to pull off the mild upset.
Trailing 64-61 with 10 seconds left in regulation, the Braves' Jeremy Johnson hit one free throw at the six-second mark and Isaac Porter hit two clutch free throws with 2.6 seconds left to force overtime.
Chris Monroe, Scott County's 6-foot-6 center, hit a field goal to push the Braves ahead to stay at 70-69 with about a minute to go in the overtime period.
Porter paced Scott County with 21 points.