Nationals at Dodgers, 5:10 p.m.
Dee Gordon, 2B
Hanley Ramirez, SS
Adrian Gonzalez, 1B
Matt Kemp, RF
Scott Van Slyke, LF
Yasiel Puig, CF
Juan Uribe, 3B
A.J. Ellis, C
Roberto Hernandez, P

By Jon Weisman

Joc is in the house.

In addition to Alex Guerrero, Tim Federowicz and Yimi Garcia, highly touted prospect Joc Pederson, fresh off his mega-season at Triple A, has joined the Dodgers on the first day of expanded rosters.

Pederson and Garcia, who had a 3.10 ERA with 69 strikeouts against 81 baserunners in 61 innings, will be making their Major League debuts if and when they enter a game.

Guerrero played in both Australia games for the Dodgers, striking out in his only at-bat. He ended his first Triple-A season with a .364 on-base percentage, .613 slugging percentage and 15 home runs.

Federowicz, 8 for 61 with three doubles, three walks and a homer as a Dodger earlier this season, OPSed .938 for Albuquerque.

The Dodgers also activated reliever Chris Perez from the disabled list.

Update: The Dodgers designated Carlos Triunfel for assignment to make room for Pederson on the 40-man roster.