Mazzaro has joined Sacramento after accepting his assignment to Triple-A, Joe Salvatore of KCBS Radio reports.
Mazzaro was designated by the Giants on Friday after two appearances which resulted in an ERA of 63.00 and WHIP of 8.00. Despite the obviously horrendous start to the season, the 29-year-old still has plenty of major league experience and could certainly find his way back to the Giants' bullpen at a later point in the summer.