He made his Major League Baseball (MLB) debut with the Chicago Cubs in 2014 and also played for the San Diego Padres.

[3] He attended Lower Cape May Regional High School, where he earned varsity letters in football, baseball, and track and field.

In football, Szczur played wide receiver, running back, wildcat quarterback and was a return specialist on special teams.

During his junior season, he was a consensus All-American and was named the CAA Offensive Player of the Year as Villanova went on to win its first-ever FCS National Championship.

During his junior season, he was a First Team All-Big East selection and named the Philadelphia Big 5 player of the year for baseball.

[1][5] He received a $100,000 signing bonus, with an additional $500,000 if he declined to attend the NFL combine and made a written commitment to baseball before February 10, 2011.

On April 29, 2016, he hit his first career Major League grand slam against Chris Withrow of the Atlanta Braves in the 8th inning, putting the Cubs up 6–1.

[20] Szczur spent the year with the Triple-A Reno Aces, also playing in 3 games for the AZL Diamondbacks, slashing .313/.380/.569 with eight home runs and 29 RBI.

[21] Szczur signed a minor league contract with the Philadelphia Phillies on December 13, 2019, with an invite to major-league spring training camp.

[24] On February 13, 2021, Szczur signed a minor league contract with the St. Louis Cardinals organization that included an invitation to Spring Training.

Szczur essentially saved the girl's life given the severity of her condition and how hard it would have been to find another person that was a match for bone marrow.