Donald Jacob Hager Jr. (born March 24, 1982) is an American professional wrestler and former amateur wrestler and mixed martial artist. He is best known for his tenures in WWE as Jack Swagger and in All Elite Wrestling (AEW) as Jake Hager. As a mixed martial artist, he was signed to Bellator MMA and competed in the heavyweight division.

Hager attended the University of Oklahoma as a two-sport athlete, participating in both football and wrestling. He switched to wrestling full-time in his sophomore year, and in 2006, set the record for most pins in a season with 30 as an All-American. Following a try-out, Hager signed a WWE contract in mid 2006 where he performed as Jack Swagger. During his time with WWE, he became a two-time world champion, having held the WWE's World Heavyweight Championship and the ECW Championship once each and a one-time United States Champion. He left the company in 2017 after he decided to pursue a professional mixed martial arts (MMA) career.

In 2017, Hager signed with Bellator MMA. He had his first professional fight on January 26, 2019, against J.W. Kiser at Bellator 214, where he won via arm-triangle choke in the first round. In his second fight with the promotion, he faced T.J. Jones on May 11, 2019, at Bellator 221, where he again won via arm-triangle choke in the first round. Hager announced his retirement from MMA in September 2023. He was undefeated with a record of 3–0 (1). As a wrestler, he kept working with various promotions before signing with AEW in 2019, including in Lucha Underground as Jake Strong, where he was the final Lucha Underground Champion. (Full article...)