[5] The following week, he started against NC State, where he completed 15 of 28 pass attempts for 140 yards and one interception.
[7][8] In that game, he completed a career-best 52-yard pass to Geroy Simon in the fourth quarter and then connected with tight end Tim Brown for a two-point conversion.
[5] Against Florida State, he saw action in the Terrapins' last two series, where he completed one pass for nine yards and made two rushing attempts.
Mastrole started against West Virginia, but was held to three completions on nine passes for 27 yards, before being replaced by Jones in the third quarter.
[13] After Maryland head coach Ron Vanderlinden changed the offensive scheme to the option, Mastrole, a drop-back passer,[14] decided to transfer.
For his senior season in 1999, he transferred to the University of Rhode Island, which employed a three-receiver offense.
[20][21] In November 2001, he auditioned for the Carolina Panthers, who needed a quarterback after injuries to Chris Weinke and Dameyune Craig.
On May 3, Mastrole was signed by the Scottish Claymores as a reserve behind starter Scott Dreisbach and backup James Brown.
On May 16, Mastrole was activated from the Amsterdam practice squad to serve as the second-string quarterback, and saw action against Barcelona.
In the preseason game against St. Louis Rams, Mastrole led an 81-yard drive for the game-winning touchdown.
[33][21] Mastrole said "I could have stayed in Detroit, but I left on my own terms" and that "I figured I'd take a pay cut and go play.