McReynolds, making his 20th series start, took the lead eight laps from the finish and held on following a two-lap overtime to take the victory in the Casey’s General Store 150.
“I knew that whoever could get a good jump on the last restart was probably going to come out with the victory,” said McReynolds, the son of NASCAR Fox TV analyst and former crew chief, Larry McReynolds. "It was pretty much hammer down there at the end."
Scoring his first career series win in such a big event is a major boost of confidence, according to McReynolds, who will celebrate his 24th birthday on Thursday.
The East-West combination race will be televised on NBC Sports Network on May 21.