He played in the mid-season Southern League All-Star Game and was added to the Dodgers' 40-man roster after the season to protect him from the Rule 5 Draft.
On May 28, he was again called up to replace the injured Ted Lilly, but returned to AAA one day later, again without appearing in a game.
Antonini played with the New Jersey Jackals of the Canadian American Association of Professional Baseball in 2014.
During 2015 and 2016, Antonini was with the Bridgeport Bluefish; during those two seasons he made a combined 28 appearances (all starts) with an 8–12 record and 3.43 ERA.
On July 12, 2019, Antonini's contract was purchased by the Pericos de Puebla of the Mexican League.
On September 3, 2019, Antonini re-signed with the Somerset Patriots of the Atlantic League of Professional Baseball.