Undrafted out of college, Lalli signed with the Chicago Cubs as a free agent in 2006. He was named a Southern League All-Star in 2009, 2010, and 2011.[5] The Cubs promoted Lalli to MLB on May 18, 2012, and he made his MLB debut that day.[5] He became the first GWU alumnus to appear in MLB.[2]
On November 14, 2012, the Milwaukee Brewers signed Lalli to a minor league contract and invited him to spring training.[7] On April 9, 2013, Lalli's contract was purchased and he was added to the Major League roster by the Brewers.[8] He was designated for assignment on September 19, 2013, and became a free agent on October 1.[9]
Arizona Diamondbacks
On October 28, 2013, Lalli signed a minor league contract with the Arizona Diamondbacks. He became a minor league free agent after the 2014 season.[8]
On November 26, 2014, Lalli re–signed with the Diamondbacks organization on a minor league contract.[10]
For the 2018 season, Lalli was named the manager for the Kane County Cougars, the Single–A affiliate of the Diamondbacks.[14]
Jackson Generals
After one year in the Chicago suburbs, he left to become manager of the Jackson Generals for the 2019 season. In one season with the Generals, Lalli led the team to their third championship in the last four seasons in the Southern League.
Reno Aces
On February 1, 2021, Lalli was announced as the new manager for the Reno Aces.[15] He became the youngest manager in Aces history and first to be a former Aces player.