The Cougars tacked on two more in the sixth thanks to an inning-extending error an RBI groundout by Kyle Bray and a two-out RBI single by Powless.
"Hitting's such a confidence thing, and Noah started out the year well and he's kind of been in a slump," Jones said. "I could see the smile on his face after he hit a couple balls hard."
St. Anthony scored one in the fifth on a throwing error by Dylan Smith to cut it to 3-2, but gave up the two runs and trailed by three entering the seventh.
Peters got the first two batters on a strikeout and a flyout, then gave up back-to-back singles to Neil Williams and Eli Dasenbrock, the latter driving in Williams after a wild pitch.
Austin Bushur hit a hard grounder down the third-base line that was booted and allowed Dasenbrock to score. Peters shut the door from there.
Williams was 3-for-4 on the day. No other Bulldog had more than one hit on the day, thanks to some bad luck with the stick.
"We hit the ball hard, we made how many hard outs right to people," Koenig said. "If you make hard outs, you'll be in the lineup."
Ross and Powless each went 2-for-3 with two RBIs. Peters struck out seven in a complete game win.
It's a reversal of fortune for South Central, who lost to St. Anthony 7-1 in the North Clay Showcase Saturday.
"A game like this really matters because it's a conference game, and I think our guys were more ready to play than they were Saturday," Jones said.
St. Anthony (13-6, 3-2) plays a makeup game from Friday's rainout at Altamont today, and South Central (7-3, 5-1) takes on Neoga Thursday on the road.
South Central 001 022 0 5 10 2
St. Anthony 100 010 2 4 7 1
WP - Peters (7 IP, 7 H, 4 R, 3 ER, 7 K, 3 BB) LP - Gardewine (5.2 IP, 10 H, 5 R, 3 ER, 3 K, 4 BB)
South Central: Ratermann (2-3, BB, R); Smith (1-4); Bray (0-3, RBI, R, BB); Ross (2-3, 3B, 2 RBI, R, BB); Powless (2-3, 2 RBI, BB); Holmes (1-3, HBP); Hill (1-4, R); Henken (1-4, R)
St. Anthony: Williams (3-4, 2 R, SB); Dasenbrock (2-4, RBI, R); Bushur (1-4, RBI); Gurtner (1-3); Hoelscher (1-2, 2B, BB)