Billy Petrick

William John Petrick III (born April 29, 1984) is an American former professional baseball pitcher.

Petrick made his major league debut on June 27, for the Chicago Cubs, against the Colorado Rockies giving up two earned runs in two innings.

On February 13, 2009, Petrick signed with the Windy City ThunderBolts for their 2009 season. Petrick appeared in 11 games on the season while recovering from an injury. He went 1-0 with a 2.13 ERA in 12.2 innings, racking up three saves and 15 strikeouts while walking only three.

On April 21, 2010, the Joliet JackHammers acquired Petrick, from the ThunderBolts.

Petrick signed with the Amarillo Thunderheads of the American Association of Independent Professional Baseball for the 2015 season.

Petrick's brother, Zach, is also a professional baseball player.