Ritchey scored Greencastle's first touchdown on an 11-yard run early in the second quarter and set up Dustin Barry's third-quarter touchdown with five carries on a seven-play drive.
"He was around all offseason and he knows what's going on," said Greencastle coach Chuck Tinninis. "He's got some experience and now some confidence and we hope he keeps it up."
Barry's 24-yard touchdown run midway through the third signaled the beginning of the end for the Indians (0-3), who were never able to put together an offensive effort to match a solid defensive performance.
"I can't ask for any more from that defense," said Waynesboro coach Darwin Seiler. "I know they got some yards in the second half, but our defense was on the field for a heck of a long time."
Both teams struggled to move the ball in the first half as they combined for just six first downs and 10 punts. But the Blue Devils (3-0) got the break they needed on one of those punts.
On the final play of the first quarter, Rusty Cordell muffed a punt from Waynesboro's Terrell Rickard at the Greencastle 42, but the ball bounced right back to him. He sidestepped one tackle and muscled his way for a 34 yard return to the Indians 24-yard line.
Four plays later, Ritchey found the end zone for a 6-0 lead.
Waynesboro had two opportunities late in the second quarter. Following a Greencastle punt, Rickard broke off a 27-yard run to the Blue Devils 24, but the Indians turned the ball over on downs.
On the next play, Ritchey threw a pass in the flat that Waynesboro's Nathan Kauffman nearly picked off for a sure touchdown.
The Blue Devils got 159 of their 257 rushing yards in the second half. Barry finished with 95 yards on 16 carries.
"We just thought we were going to run at them and wear them down and we did," Tinninis said.