Don't know..trying to find out
This is from last Monday, via Kevin Goldstein/BP
Mark Prior, RHP, Red Sox (Triple-A Pawtucket)
Prior struck out four batters on Friday, and in three appearances for the PawSox, he has now recorded 10 whiffs over 4 2/3 innings while allowing three hits and two walks. His fastball has gotten up to 93 mph, and one insider noted its deception as well; hitters are clearly having a difficult time picking the ball up out of his hand. He's 31 years old, however, and hasn't pitched in the big leagues since 2006. Prior could have easily hung them up years ago without any guilt, but there he is, in Rhode Island and missing bats. I don't think there's a player in the minors I'm rooting for more.
Very interested to see this start