Leyland went to third when an errant pickoff throw to second skipped into center field, leaving the go-ahead run 90 feet away with no outs.
Ronnie Shaeffer popped out. A near-disastrous squeeze attempt followed when junior Scott Gottschling threw his bat at pitchout that the Davis catcher had indicated before the pitch, as the Aggies were attempting to issue a free pass.
Leyland dived back into third just ahead of the throw from the catcher on the play, dodging a rally-killing pickoff.
After Gottschling walked, starting pitcher Matt Summers, a former two-way player, was called on to pinch hit, his first at-bat of the season. After working a 3-1 count, Summers received an intentional ball four to load the bases.
Reyes took the first pitch for a ball, then fouled off a safety squeeze attempt.
He took strike two then, with a 2-2 count, bunted the ball cleanly to the pitcher up along first. Leyland lumbered home to give UCI the lead and Reyes collected a hit when no one covered first base.
Gottschling was out at the plate trying to score on the play and the inning ended on a subsequent popup.
Senior Brian Hernandez, who was four for four and is now seven for nine for the week as the UCI starting third baseman, worked a perfect ninth to record his eighth save. Hernandez, who raised his batting average 20 points to a team-leading .358, earned the pitching victory Tuesday. He is now 3-0 with eight saves and his earned-run average is 0.96 in 18 2/3 innings. Hernandez also continued to display sparkling defensive at third base, diving to his left to rob a hit and limit a Davis rally in the sixth inning.
"Hernandez was a star tonight every way you can think of," said UCI Coach Mike Gillespie,who added that his third baseman and closer has been "a phenomenal player all year."