Casey Lee Lawrence (born October 28, 1987), nicknamed "Twig",[1] is an American professional baseball pitcher in the Seattle Mariners organization.

[3] Lawrence was not selected in the 2010 Major League Baseball draft, and signed with the Toronto Blue Jays as an undrafted free agent.

[7] He was assigned to the Low–A Auburn Doubledays, where he was named a mid-season All-Star,[8] and earned a promotion to the Single–A Lansing Lugnuts before the end of the season.

[2] Lawrence pitched the majority of the 2011 season with Lansing, and was called up to the High–A Dunedin Blue Jays four separate times for brief stints.

[2] Lawrence went to Major League spring training with the Blue Jays as a non-roster invitee, and was assigned to the Triple-A Buffalo Bisons on April 8.

[2] Lawrence participated in 2015 Major League spring training, and played mostly for New Hampshire that year, making one start for Buffalo in May.

[2] 2016 saw Lawrence remain in Triple–A for the first significant amount of time in his career, as he split the year with the Bisons and Fisher Cats.

[11] Due to two separate weather delays and his call-up to the Majors, Lawrence did not make the start on Opening Day.

[13] He made his MLB debut that night against the Tampa Bay Rays, taking the loss after walking in the winning run in the 11th inning.

[16] On June 1, he set a Mariners franchise record for most strikeouts in a single relief appearance when he struck out 9 batters over 5 innings against the Colorado Rockies.

[25] On January 28, 2020, Lawrence signed a minor league deal with the Minnesota Twins, but was released before the season began.

He was assigned to the team's training site in St. Paul, but did not pitch in a game for the Twins organization in the shortened 2020 season.

On May 19, prior to the start of the ALPB season, Lawrence’s contract was purchased by the Toronto Blue Jays organization.

[34] After 3 starts for the Triple-A Memphis Redbirds, on August 15, the Cardinals selected Lawrence's contract after they placed Steven Matz on the injured list.

[36] On February 7, 2024, Lawrence signed a minor league contract with the Seattle Mariners that included an invitation to spring training.