According to the transactions page on MiLB.com, pitcher Vin Mazzaro and first baseman Chris McGuiness have both elected to become free agents. McGuiness was recently dropped from the 40-man roster when the Pirates added John Holdzkom to the roster. Mazzaro has been back and forth between the Pirates and Indianapolis over the last two seasons.
McGuiness led all Pirates minor league players this year with 31 doubles. The 26-year-old was acquired over the off-season from the Texas Rangers for pitcher Miles Mikolas and he never appeared in the majors this season. McGuiness hit .264/.358/.412 in 126 games for Indianapolis.
Mazzaro made five relief appearances for the Pirates this year, giving up four runs over 10.1 innings. He was designated for assignment twice this year, once just prior to the start of the season and then again at the end of May. Each time he went unclaimed through waivers and accepted his assignment to Indianapolis.