The San Diego Padres traded for former Padres pitching prospect RHP Matt Wisler on April 1st, and needed to make room on the roster for him. That led to this transaction earlier today:
The #Padres have optioned RHP Phil Maton to Triple-A El Paso and RHP Matt Wisler has reported to the Major League club and been added to the 25-man roster.
— San Diego Padres (@Padres) April 4, 2019
Maton has appeared in 3 games this season, giving up 2 earned runs in 4 total innings pitched.