April 20 in Tampa Bay baseball:
- Outfielder Jason Romano was designated for assignment.
- Pitcher Travis Harper was recalled from Triple-A Durham.
- Pitcher Mark Hendrickson was placed on the 15-day disabled list, retroactive to April 14, with left shoulder inflammation.
- Outfielder Rocco Baldelli was transferred from the 15-day disabled list to the 60-day disabled list.
- Pitcher John Webb was selected from Triple-A Durham.
- Infielder Dan Johnson was activated and added to the 25-man roster.
- Pitcher Jeff Niemann was optioned to Triple-A Durham.
- Pitcher Matt Garza was sent to Advanced-A Vero Beach for an injury rehab assignment.
- Vaughn, Rick; Costello, Chris; Molina, Carmen et al., eds (2005). Tampa Bay Devil Rays 2005 Media Guide. St. Petersburg, FL: Devil Rays Public Relations Department. p. 265.
- Vaughn, Rick; Costello, Chris; Molina, Carmen et al., eds (2006). 2006 Tampa Bay Devil Rays Media Guide. St. Petersburg, FL: Devil Rays Public Relations Department. p. 264.
- "Roster >> Transactions: April 2008". RaysBaseball.com. MLB Advance Media. http://tampabay.rays.mlb.com/team/transactions.jsp?c_id=tb#month=4&year=2008&team_id=139. Retrieved February 22, 2013.
- "Florida State League Transactions: April 2008". MiLB.com. Minor League Baseball. http://www.milb.com/milb/stats/stats.jsp?t=l_trn&lid=123&sid=l123&ymd=200804. Retrieved February 23, 2013.