The Bluejays led wire-to-wire in the game between the two Oregon County rivals, although Alton fought hard and pulled close to Koshkonong, especially in the first half.
But it didn't take the Jays long to show off the firepower they're loaded with this year.
Shane Davis drilled a trey for the game's first points and then he followed that with a spinning layup for Koshkonong.
Davis led all scorers with 25 points.
Garrett Belcher (14 points) made the score 7-0, Bluejays, with a jumper at the 4:39 mark of the first.
Brent Tackitt (four points) finally broke the ice for the Comets with a hoop near the two-minute mark of the first, for Alton's first points.
Tyler Thompson was fouled with a half-second showing on the clock and he drained two charity tosses to pull the Comets within five, 9-4, after one.
Thompson paced Alton with 16 points.
Alton edged within two early in the second thanks to back-to-back buckets in the paint from Stetson Neldon (10 points).
But just as they would for the remainder of the game, when threatened, the Jays responded with a big run.
Davis hit a jumper and Wayne Cahoj (13 points) tacked on a hoop in the lane, starting a 10-0 burst for Koshkonong.
Davis capped the run with a pair of free throws with 3:01 left until the half, giving the Bluejays a 23-10 advantage.
However, the Comets were not satisfied to be trailing by double digits at the break and they did something to fix that.
Neldon shook free for a bucket down low, followed by a stickback from Tyler Thompson. Trent Thompson then drilled a short jumper, followed by a long bomb from his brother with 52 ticks left that pulled Alton within four, 23-19.
Davis ended the first half with a charity toss, sending the teams to intermission with Koshkonong in front 24-19.
Needing to open the second half with a spirited charge if they planned on pulling even with the Jays, the exact opposite happened for the Comets.
Koshkonong started the third period with a 13-3 run to up its lead to 36-24.
Finishing what they started in the frame, the Jays racked up the last nine points of the third to move in front 52-26 after three, outscoring Alton 28-7 in the period.
Tim Voss did most of the damage for Koshkonong in the fourth, as he came off the bench to toss in 11 points in the game's last eight minutes, putting the finishing touches on the Jays' 69-36 victory over Alton.
Robert Gatewood finished with six points for Koshkonong, while Dillynn Cook added two.
Tim Crews and Kevin Smith logged two points each for the Comets.