Apr 09:
DeRosa is not in the lineup for Tuesday's game in Detroit, Sportsnet reports.

Apr 04:
DeRosa is in the lineup starting at third base and hitting seventh against the Indians on Thursday.

Mar 25:
DeRosa and Maicer Izturis will begin the season as a platoon at third base with Brett Lawrie set to begin the season on the DL, the National Post reports.

Mar 21:
DeRosa is batting .429 (12-for-28) with two doubles and two home runs so far this spring.

Mar 09:
DeRosa is expected to see time at third base if Brett Lawrie's strained rib cage muscle keeps him out past the start of the season, MLB.com reports. "We brought DeRosa in to play that spot, too. It is all going to depend on how [Lawrie] progresses the next week or so, and we will get a better idea of how long it's going to take before we do anything," manager John Gibbons said.

Mar 02:
DeRosa is not available to play Saturday because of a sore back but he might be able to return Sunday, Gregor Chisholm of MLB.com reports.

Jan 22:
DeRosa agreed to a one-year contract with the Blue Jays on Tuesday, Sportsnet reports. His deal will pay him $750,000 and includes an option at the same price for 2014.

Oct 06:
DeRosa will be left off the Nationals' postseason roster, MLB.com reports.

Sep 01:
DeRosa (groin) was indeed activated from the DL on Saturday, the Nationals' official Twitter page reports.

Aug 28:
DeRosa (groin) will be activated from the disabled list on September 1, the Washington Times reports.

Aug 06:
DeRosa (groin) has been placed on the 15-day DL, the Nationals' Official Twitter Account reports.

Jul 20:
DeRosa replaced Ryan Zimmerman at third base on Thursday for the final three innings, going 2-for-3 with two runs scored.

Jun 25:
The Nationals have officially reinstated DeRosa from the 15-day-DL on Monday, the team's official twitter account reports

Jun 22:
Nationals' manager Davey Johnson said DeRosa (oblique) will only need two to three more rehab games before returning from the disabled list, reports Amanda Comak of the Washington Times.

Jun 06:
DeRosa will begin a rehab assignment either Thursday or Friday for High-A Potomac, CSNwashington.com reports.

Jun 02:
DeRosa (oblique) is getting ready to begin a rehab stint at High-A Potomac, the Washington Post reports.

May 16:
DeRosa (oblique) will start throwing off flat ground Wednesday, Bill Ladson of mlb.com reports.

May 11:
DeRosa reportedly has aggravated his injured left oblique muscle giving a high-five to Bryce Harper on Sunday after the rookie stole home against the Phillies, according to the Washington Times. "I don't know if that set back the rehab or not," manager Davey Johnson said. "But I said, 'Why didn't use your (right) hand?' He said it was spur of the moment."

May 02:
An MRI revealed that Mark DeRosa does indeed have an oblique strain, reports Adam Kilgore of the Washington Post.

May 01:
Nationals Manager Davey Johnson says DeRosa's oblique strain will keep him out "at least the full 15 days" reports Amanda Comak of the Washington Times.

Apr 29:
DeRosa has a left oblique strain, Amanda Comak of the Washington Times reports.

Apr 28:
DeRosa got the start in right field Friday against Clayton Kershaw and went 0-for-4.

Apr 21:
DeRosa is out of the picture for playing time in left field, the Washington Post reports.

Apr 14:
DeRosa may not platoon with Adam LaRoche at first base after all, the Washington Post reports.

Apr 12:
DeRosa is not in the starting lineup Thursday, the Washington Post's Adam Kilgore reports.

Apr 11:
DeRosa got the start in left field Wednesday and got on base for the first time this season, going 1-for-2 with three walks, a run scored and an RBI.

Apr 05:
DeRosa will start in left field for the Nationals on Opening Day, according to the team's official Twitter page.

Mar 30:
DeRosa could see semi-regular starts at first base this season, as Nationals manager Davey Johnson is thinking about platooning him with Adam LaRoche, the Washington Post reports.

Mar 29:
DeRosa (calf) was scratched from Thursday's lineup, Adam Kilgore of The Washington Post reports.

Mar 28:
DeRosa sat out Wednesday's spring training game with a cramp in his calf, William Ladson of MLB.com reports.

Mar 18:
DeRosa's hitting .429/.636/.714 with eight walks and no strikeouts in 22 plate appearances so far this spring.

Feb 20:
Mike Cameron's retirement could open the door for more playing time for DeRosa, the Washington Post reports.

Dec 28:
DeRosa has officially signed with Washington, the club's official Twitter feed reports.

Dec 23:
The Nationals are on the verge of signing DeRosa, the Washington Post reports.

Aug 04:
DeRosa (wrist) has been activated from the disabled list and added to the major league roster, reports Amy Gutierrez of CSN Bay Area.

Jul 19:
DeRosa (wrist) said he was "pleasantly surprised" by how good he felt singling and doubling in five at-bats during two rehab games for Class-A San Jose, the San Francisco Chronicle reports.

Jun 20:
DeRosa said he felt OK while hitting off a tee, but he still has no clue whether he'll be able to resume his career with a torn tendon in his left wrist, the San Jose Mercury News reports.