Age on Opening Day 2015: 35
How acquired: Signed as free agent, Dec. 2010
2015 salary: $21 million
Age on Opening Day 2015: 22
How acquired: Drafted 1st round, June 2010
2015 salary: $2.5 million
UPDATED: 10:31 p.m.
Aside from the still-up-in-the-air situation at second base, the Nationals know who's going to be in their regular 2015 starting lineup.