The 23-year-old Frias was on the Brooklyn Cyclones at the time of the deal. Ironically, the Cyclones were playing the A's short-season affiliate - the Vermont Lake Monsters - on Friday, so Frias didn't have to travel far to join his new team. Frias is the third player acquired by the A's this season who simply had to switch dugouts to join his new team (Jacob Nottingham and Daniel Mengden were the other two).
Frias signed with the Mets out of the Dominican Republic in 2008. He made his US debut in 2010 and reached the full-season leagues for the first time in 2013. In 2014, Frias spent the entire year with Low-A Savannah. He had a 2.98 ERA with 76 strike-outs in 57.1 innings.
This season, Frias started the year in extended spring training. He made his debut with Savannah on May 7. He struggled in 20.1 innings with the Sand Gnats. He struck-out 22 but walked 16 in 20.2 innings. In four appearances with the Cyclones, Frias allowed three earned runs in eight innings. He walked four and struck-out one.
Frias will be eligible for minor league free agency this off-season.