Drafted by the Padres in the second round of the 2006 MLB Draft, LeBlanc posted a 3.02 ERA in 14 appearances – including ten starts – across two levels of the farm system to close out his first year of professional baseball.
He made his debut as a September callup in 2008, making four starts and an appearance out of the bullpen. He returned to Triple-A El Paso for the majority of the 2009 season but returned to make nine starts and transitioned into the rotation in 2010.
In 26 appearances – including 25 starts – LeBlanc posted a 4.25 ERA while striking out 110 batters in 146.0 innings. He struggled with his command at times with over three BB/9. The following season would be his last in San Diego, making 11 starts and posting a 4.63 ERA while struggling to harness his command.
After the 2011 season, the Padres traded LeBlanc to the Marlins for catcher John Baker. After bouncing around on a few teams, he spent the 2015 season playing for the Saitama Seibu Lions, posting a 4.23 ERA in eight starts.