Storen made his major league debut on May 17, 2010, against the St. Louis Cardinals, retiring two batters in ⅔ of an inning.
Storen recorded his first major league save on August 6, 2010, against the Los Angeles Dodgers.
In 2010, he pitched 55​¹⁄₃ innings over 54 games, finishing with a 4–4 record and a 3.58 ERA with five saves.

In 2011, Storen became the team's closer.
He pitched 75​¹⁄₃ innings over 73 games, finishing the year with a 6–3 record, with 43 saves, and a 2.75 ERA.
He tied for fourth in the MLB in saves.
Storen made his major league debut on May 17, 2010, against the St. Louis Cardinals, retiring two batters in ⅔ of an inning. Storen recorded his first major league save on August 6, 2010, against the Los Angeles Dodgers. In 2010, he pitched 55​¹⁄₃ innings over 54 games, finishing with a 4–4 record and a 3.58 ERA with five saves.
In 2011, Storen became the team's closer. He pitched 75​¹⁄₃ innings over 73 games, finishing the year with a 6–3 record, with 43 saves, and a 2.75 ERA. He tied for fourth in the MLB in saves.
Drew Storen