The Mustangs (3-2) won two of the three doubles matches before splitting the singles matches with the Green Terror (3-3) to preserve the one-point win.
Kelly teamed with Shawn Hellman for an 8-4 victory at third doubles before taking a 6-4, 6-3 win at No. 5 singles to clinch the match for Stevenson.
Hellman added a 6-4, 6-2 win at sixth singles.
In the match of the night, Daniell Keltz rallied in the third set to force the tiebreaker and eventually won that, 12-10.
Ben Faber (Wayne, Pa./Conestoga) went 2-0 lead the Green Terror, teaming with Dan Hovorka (Storrs, Conn./E.O. Smith) for an 8-7 win at No. 1 doubles before taking his second singles, 6-0, 6-0.
McDaniel returns to action at home against Muhlenberg on Wednesday. Match time is 1 p.m.
No. 1: Dan Hovorka/Ben Faber (M) def. Ted Cooke/Korey Garner 8-7 (7-1);
No. 2: Randy Speck/Kevin Stamm (S) def. Justin Ward/Daniell Keltz 8-0;
No. 3: Shawn Hellman/Shawn Kelley (S) def. Adrian Pettaway/Dan Green 8-4.
No. 1: Cooke (S) def. Hovorka 6-2, 6-2;
No. 2: Faber (M) def. Garner 6-0, 6-0;
No. 3: Ward (M) def. Stamm 7-5, 6-3;
No. 4: Keltz (M) def. Speck 6-1, 3-6, 7-6 (12-10);
No. 5: Kelley (S) def. Pettaway 6-4, 6-3;
No. 6: Hellman (S) def. Green 6-4, 6-2.