The Dublin Coffman and Olentangy football teams have met four times in the past three seasons, splitting the contests.
Both the Shamrocks and Braves want to gain the upper hand in the series when they meet Friday, Sept. 20, at Olentangy.
Coffman won the first matchup 35-0 in 2016 and the Braves won both meetings in 2017, 31-14 during the regular season and 28-24 in the first round of the Division I, Region 2 playoffs. The Shamrocks won 22-16 last season.
"The last couple of times we met, the games were pretty close," said Olentangy coach Mark Solis, whose team is 2-1 after defeating Holland Springfield 35-14 on Sept. 13. "This is the last time we will play them in a while, so we would like to get the win in the series.
"I expect it to be a close game and I'm sure (Coffman coach) Mark (Crabtree) would say the same thing. Our kids will come prepared to play and hopefully we can be in a tight game in the fourth quarter to give ourselves a chance to win."
The Shamrocks are 3-0 after defeating Dublin Jerome 31-14 on Sept. 13.
"We've gotten pretty familiar with them, and they are familiar with us," Crabtree said. "As a team, we have to come in prepared mentally. If you are prepared mentally, the physical will follow."
After losing to Hilliard Darby 23-13 in its opener Aug. 30, Olentangy defeated Miamisburg 37-6 on Sept. 6 before beating the Blue Devils.
"I like where we're at," Solis said. "We're playing a lot better than in Week 1, but that's a testament to Darby keeping our offense off the field. We're also getting better defensively."
Against the Blue Devils, quarterback Trent Maddox was 16-for-23 passing for 251 yards and three touchdowns. He also rushed for 48 yards and one score on four carries.
"They are a good team and traditionally they have a good offensive scheme," Crabtree said. "I like their quarterback a lot and he seems to be doing a pretty good job for them.
"They are playing good, tough defense and they are keeping teams from scoring points. They look to be really solid."
Shamrocks all-state slotback Mike Drennen made his season debut against Jerome after missing the first two games with a foot injury. The senior caught four passes for 24 yards and rushed three times for 14 yards.
Quarterback Connor Mathews led the Shamrocks on the ground with 105 yards on 21 carries and was 5-for-6 passing for 47 yards.
Also against the Celtics, Moussa Diallo rushed for 99 yards and three touchdowns on 21 carries, Jameel Williamson scored two touchdowns and Casey Magyar made a 20-yard field goal.
"They are a typical Coffman team: Very well-coached and obviously have a ton of talent," Solis said. "Year in and year out, they expect to contend for a conference championship and to make a long postseason run.
"There is a standard there (at Coffman), and I see a pretty good football team. It will be a heck of a challenge for us, but we'll ready for it."