In the 9th round of the 2016 draft, the Blue Jays selected Nick Hartman, a 6'1", 185 pound right handed pitcher from Old Dominion with the 282nd overall pick. He spent the last two years at Old Dominion University mostly working out of the bullpen after transferring from LSU-Eunice, a junior college where he spent one year as a starter.
In 2016, he pitched 48.2 innings across a team leading 26 games, to 4.81 ERA. The ERA isn't pretty, but the other numbers are pretty good: 51 hits, 16 walks, and 52 strikeouts. According to Jonathan Mayo on the MLB.com broadcast, he's "a reliever all the way", with a 90-95 MPH fastball out of the pen, and a decent curveball. He also noted that he was used a lot.
Earlier this year, the website Baseball Draft Report ranked him as the second best pitching prospect in Conference USA, albeit well after top prospect Jon Duplantier and at the top of a fairly interchangeable tier.
Hartman isn't exactly a senior sign since he's not a senior, but this should come significantly underslot and Hartman will probably spend most of the summer in either Bluefield or Vancouver. At the end of the video below is Hartman closing out a game against Louisiana Tech: