On the lap 25 restart, Rahmer chose the inside lane and pulled way from Buckwalter while Lance Dewease, who started fourth, got by Buckwalter for the runner-up position.
Dewease closed in on Rahmer for a few laps, but was passed on lap 27 by WoO points leader Daryn Pittman for the runner-up spot.
Rahmer entered lapped traffic with six laps to go as several fans on the frontstretch side were standing up and showing Rahmer with there arms stretched out that his lead over Pittman was growing.
When the white flag came out, the entire frontstretch grandstand rose as one to salute Rahmer and then erupted in euphoria when he took the checkered flag for a 3.4-second win over Pittman.
"I am going to talk to everybody and maybe by Wednesday we'll see, but you couldn't write a script any better than to quit right now," he said on when he might hang it up.
Pittman holds a 57-point lead over Schatz with four races left in the season to determine the 2013 WoO champion.
"We gained the points back that we lost last on Friday night," Pittman said. "We'll take it, but, three races is a long way to go yet. We have to beat him every race and that's one down."
Pittman spent the past four years racing in Central Pennsylvania and while there is a bit of sting in finishing runner-up again in the Open, to finish second to Rahmer was OK by him.
"That's my third second-place finish in the National Open and it's hard to get into a position to win these races, but I'm happy with second, we didn't have anything for Fred."
"It's fun to race with Fred and I've learned a lot about racing in the last four years and about myself and there's guys you have respect for and guys you don't in just how they drive a race car and I have a lot of respect for Fred and how he drives," Pittman added. "You couldn't ask for a cleaner race car driver and he's a really good person."