April 4 in Tampa Bay baseball:
- Infielder Brent Abernathy was claimed off waivers by Kansas City.
- Outfielder Jason Tyner was outrighted to Triple-A Durham.
- Catcher Charles Johnson was signed to a 1-year, Major League contract.
- Outfielder Michael Restovich was designated for assignment.
- Pitcher Juan Salas was placed on the restricted list.
- Catcher Dioner Navarro was placed on the 15-day disabled list.
- Catcher Mike DiFelice was selected from Triple-A Durham.
- Pitcher Ben Hendrickson was assigned to Triple-A Durham from Short-Season Hudson Valley.
- Catcher Alex Jamieson was assigned to Short-Season Hudson Valley from Triple-A Durham.
- Vaughn, Rick; Costello, Chris; Landy, Greg et al., eds (2002). Tampa Bay Devil Rays 2002 Media Guide. St. Petersburg, FL: Tampa Bay Devil Rays Public Relations Office. p. 247.
- Vaughn, Rick; Costello, Chris; Molina, Carmen et al., eds (2004). Tampa Bay Devil Rays 2004 Media Guide. St. Petersburg, FL: Devil Rays Public Relations Department. p. 293.
- 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.
- "International League Transactions: April 2008". MiLB.com. Minor League Baseball. http://www.milb.com/milb/stats/stats.jsp?t=l_trn&sid=l117&lid=117&ymd=200804. Retrieved February 23, 2013.