MacKay is an undrafted guard out of Dayton and is the first player in the history of the school to ever be invited to a WNBA camp.
"Just to know I have this opportunity to compete at this level is so amazing," MacKay said. "I owe it to all the coaches and everyone at the University of Dayton. I want to keep working hard and , ultimately, make this team."
MacKay helped lead the Flyers to 14-0 record in Atlantic-10 conference play this past season and win their first ever regular-season A-10 championship.
"Sam had a significant career at the University of Dayton," Agler said. "She is a quarterback-type point guard where she will lead and organize the floor. We are excited about her being in camp."
The Storm being the 2013 regular season May 26 in Los Angeles.
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