Hynes had been designated for assignment by the club Oct. 26.
The 28-year-old Hynes, a 31st-round pick by the Padres in the 2007 amateur draft out of Texas Tech, split his time between the Padres, Triple-A Tucson and Double-A San Antonio last season. He allowed 17 earned runs in 17 innings spanning 22 appearances in the majors for a 9.00 ERA, with 13 strikeouts. He posted a 1.52 ERA with 58 strikeouts in 41 combined appearances with San Antonio and Tucson.
San Diego's 40-man roster stands at 40.
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