Adam Rosales is fighting for a roster spot.
A's 2012 top pick Addison Russell is the youngest player in camp.
Although A.J. Griffin spent much of last season in the big leagues, this is his first major league camp.
Rehabbing from Tommy John surgery, Andrew Carignan is on-track to be pitching by mid-season.
Lefty Andrew Werner joins the A's from the San Diego organization.
Middle infielder Andy Parrino also comes to the A's from San Diego.
The 2012 season was Arnold Leon's first full season pitching after 2010 Tommy John surgery. He made it to Triple-A and was added to the 40-man roster.
Bartolo Colon returns to the A's with five games remaining on his suspension for PEDs.
2011 fifth-round pick Beau Taylor had an outstanding first full pro season in 2012. He reached Double-A.
Brandon Moss' power was a catalyst for the A's in 2012.
A's ace Brett Anderson will be pitching his first full season after Tommy John surgery.
Non-roster invitee Brian Gordon pitched in Korea last season.
After a solid 2012 season with Sacramento, Bruce Billings could be a pitcher to keep an eye on.
Chris Resop was acquired from Pittsburgh and he can start and relieve.
Newly acquired OF Chris Young is wearing Mark McGwire's old number, and the A's are hoping for big power numbers from Young.
A's CF Coco Crisp, or Slash?
Dan Straily had a meteoric rise last season. He is competing for a spot in the A's rotation.
The bearded Daric Barton is looking to regain his 2010 form after two disappointing seasons.
Middle infielder Darwin Perez, a non-roster invitee, joins the A's from the Angels.
Catcher David Freitas made a strong first impression on the A's after being acquired last season from Washington.
Derek Norris models the A's new spring training/batting practice hat.
Eric Sogard missed significant time last season with a back injury.
Evan Scribner is one of several former Padres in A's camp.
Reliever Fernando Rodriguez brings a live arm from the Houston organization.
Minor league free agent signee Garrett Olson is fitting right into the look of the A's clubhouse with his bushy beard.
Grant Balfour will miss at least a month of spring training after knee surgery last week.
A's 2009 top pick Grant Green is on the 40-man roster and is competing for an Opening Day roster spot.
Veteran left-hander Hideki Okajima signed at the start of camp to a minor league contract.
A's new shortstop Hiro Nakajima is in his first season in the US.
Jarrod Parker was a rookie last season, but he made two starts in the post-season.
Jed Lowrie was acquired just before spring training and he is expected to fill several roles for Oakland.
Slugging 3B Jefry Marte was acquired for OF Colin Cowgill from the Mets.
One of the biggest questions in A's camp is whether Jemile Weeks can recapture his rookie success.
Jerry Blevins was one of the A's most valuable relievers last season.
Jesse Chavez struggled with his command in the big leagues last year, but he has a lively fastball.
John Jaso had a big season offensively with the Mariners last year.
Jordan Norberto is healthy after struggling with a shoulder injury last year.
This is the first spring training that Josh Donaldson has reported to as a third baseman.
Josh Reddick brought out the hardware for photo day.
Reliever Kyler Newby had a strong minor league career with the Diamondbacks.
Minor league free agent signee Luke Montz, a catcher, brings big power to the organization.
A's 2010 first-round pick Michael Choice is healthy after suffering a broken hand last July. He is expected to play for Sacramento this season.
Michael Taylor has added some defensive versatility this spring, practicing at first base.
Pedro Figueroa made his major-league debut last season.
Veteran Mike Ekstrom pitched for the Rockies' organization last season.
Corner infielder Miles Head was the A's minor league player of the year last season, his first in the organization.
Sidearmer Pat Neshek is in his first camp with the A's.
Ryan Cook could be the A's closer early in the season if Grant Balfour isn't ready by Opening Day.
Catcher Ryan Ortiz is looking for a rebound season after a down 2012 campaign.
Utilityman Scott Moore spent much of 2012 playing with the Astros.
Infielder Scott Sizemore has recovered from the torn ACL that ended his 2012 season during spring training.
Sean Doolittle was pitching on the A's High-A spring training squad last season.
Seth Smith may get the bulk of the A's DH at-bats this season.
OF/1B Shane Peterson is in his first big league camp after being added to the 40-man roster this off-season.
After spending much of 2012 tinkering with his mechanics, 2011 first-round pick Sonny Gray could be in for big things in 2013.
Left-hander Tom Milone was the only A's rookie in the starting rotation for all of 2012.
Travis Blackley played a valuable role as a swingman for the A's last year.
Left-hander Justin Thomas spent last season between the Boston and New York (AL) organizations.
Big things are expected of Yoenis Cespedes in his second season.