Host Portageville (14-7) came in as one of the hotter teams in the area with four straight wins, 10 of their last 11.
The Bluejays, preparing to close the regular season against three of the area's best -- Cape Central, Poplar Bluff and Doniphan -- considered this a pivotal contest.
"We've got three tough ones coming up and that's what we need going into the district," said Charleston coach Danny Farmer. "We need to be tested and I consider this (Portageville) a tough one because Jim's (Portageville coach Bidewell) teams always play hard, relentless, and never give up, so for us to come in here and dismantle them, we feel good about that."
Charleston (17-5) extended its win streak to four with its seventh victory in its past eight outings.
The Bulldogs kept pace for most of the first quarter, but, with the score knotted at 11, Charleston began taking control with an 8-0 run to close the period. Three turnovers in the closing minutes triggered the Bluejays' run.
"Our plan was to come out and pressure them," Farmer said. "I watched them play a few times and I thought pressure would get to them a little."
Justin Clark, Charleston's junior outside threat, paced the 'Jays first-quarter offense with 10 points, including two 3s.
Charleston senior Tavis Hamilton's banked 3-pointer to open the second quarter proved to be a harbinger of things to come for the Bulldogs.
The 'Jays extended their lead to 40-22 while blistering the net at 75 percent accuracy (8-of-12 2s, 1-of-1 3s). For the game, Charleston outshot Portageville 56.8 to 43.7 percent from 2-point range, 37.5 to 27.3 from beyond the arc.
With the score at 24-12, junior post Jamarcus Williams ignited the Charleston attack with three consecutive jumpers for six of his 10 points in the stanza. Hamilton chipped in with seven.
On the evening, Williams led the Bluejays with a game-high 18 points, Hamilton added 16 and Clark 15. Shawn Sherrell, directing the offense from the point guard position, tallied eight.
Trey Mosby topped the Bulldogs with 15, their lone scorer in double figures. Marcus Greene added eight and Cory Chamberlain and Patrick Morton had seven apiece.
Neither team mustered much offense -- 10 points each -- in a rather slow-
paced third quarter.
Then, with the game decided and fresh Charleston reserves getting most of the minutes in the fourth period, the Bluejays outscored the Bulldogs 20-8 to close out the victory.
The performance of the bench caught Farmer's attention. "Earlier, I was waiting for my bench to come around and now it's the end of the season and they have accepted their roles," he said. "They can come in and help.
"(Junior guard Joseph) Watts is doing a super job defensively and (freshman guard Antonio) Riggens can help. I'm trying to go even deeper down the bench with (6-3 sophomore Brian) Parham, (6-2 junior Markale) Kent and the big (6-8 senior Seth) Stephenson kid. They can give guys a breather and we're going to need that."
Charleston won the junior varsity game 61-31.
Jerquawn Sherrell led the Bluejays' scoring with 12 points, while Donald Dixon, Brandon Gillespie and Parham had 10 apiece.
D.J. Birdwell paced Portageville with a game-high 13 points.
Charleston hosts Cape Central on Tuesday and Portageville resumes action with a visit to New Madrid County Central on Friday.
Charleston 70, Portageville 40
CHARLESTON (70) -- Shawn Sherrell 8, Tavis Hamilton 16, Brian Parham 2, Jamarcus Williams 18, Justin Clark 15, Walter Jackson 4, Brandon Dowell 3, Seth Stephenson 4. FG 25, FT 2-3, F 12. (3-pointers: Clark 3, Hamilton 2, Dowell 1. Fouled out: none).
PORTAGEVILLE (40) -- Cory Chamberlain 7, Jacob Estes 3, Trey Mosby 15, Marcus Green 8, Patrick Morton 7. FG 14, FT 3-6, F 8. (3-pointers: Mosby 1, Estes 1, Morton 1. Fouled out: none).