Scott Sizemore will undergo surgery on his left ACL on Tuesday.

Sizemore faces another long rehab. He'll obviously miss the 2013 season, and it's possible he won't be ready for the start of the 2014 campaign.

Scott Sizemore has re-torn his left ACL and will miss the remainder of the 2013 season.

Athletics placed INF Scott Sizemore on the 15-day disabled list with a sprained left knee.

Sizemore suffered the injury during Tuesday's game against the Angels and could be out for several weeks. Eric Sogard will serve as the A's primary second baseman. Andy Parrino has been called up from Triple-A.

Scott Sizemore is scheduled to return to Oakland on Wednesday to undergo an MRI on his left knee.

Sizemore left Tuesday's game against the Angels due to a sprained knee. The 27-year-old underwent surgery on the very same knee last spring, so he's hoping it's just scar tissue. However, the banged-up Athletics will likely be forced to make a roster move. Andy Parrino is the leading candidate to be called up from Triple-A Sacramento.

Scott Sizemore left Tuesday's game against the Angels due to a sprained left knee.

It's the same knee in which he tore his ACL last year. Consider Sizemore day-to-day right now, but if he lands on the DL, the A's will probably recall Jemile Weeks to share time with Eric Sogard at second base.

Scott Sizemore broke out of a funk Monday by going 4-for-4 with two RBI and two runs scored as part of a 9-7 win over the Brewers.

All four hits were singles. Sizemore entered Monday's action batting just .171 (7-for-41) this spring, so it was good timing as he attempts to hold off Adam Rosales and the hot-hitting Eric Sogard for playing time at second base.

Scott Sizemore (hand) is back in Thursday's Cactus League lineup.

Sizemore was hit in the left hand by a pitch on Sunday, but he managed to avoid serious injury. The 28-year-old is a strong candidate to win the A's starting second base job.

Scott Sizemore (hand) fielded grounders Monday and took batting practice Tuesday.

Sizemore was hit in the left hand by a pitch on Sunday, but an X-rays ruled out a fracture. The swelling has gone down, so he hopes to play in a game as soon as Thursday.

X-rays taken Monday morning on Scott Sizemore's bruised left hand showed no fracture of any kind.

Sizemore was hit by a pitch Sunday during a Cactus League game. He should return to action at some point this week.

Scott Sizemore left from Sunday's Cactus League game with a bruised left hand.

Sizemore was hit by a pitch and taken out of the game as a precautionary measure. He had hits in both of his plate appearances before getting removed.

According to Jane Lee of MLB.com, Scott Sizemore is fully healthy after missing the entire 2012 season with a torn ACL in his left knee.

Sizemore was scheduled to be the A's starting third baseman for the 2012 season before the injury on this first day of workouts derailed his season. He'll head into spring training competing for time at both third and second base. He has an intriguing blend of power and speed, and could be a potential fantasy sleeper if he can find his way into an everyday role.

Athletics GM Billy Beane stated Saturday that Scott Sizemore will return to his regular position of second base for the 2013 season.

Sizemore was penciled in as the A's starting third baseman in 2012, but he suffered a major injury in Spring Training and was forced to miss the entire year after ACL surgery. He'll likely have to compete with Jemile Weeks for the Opening Day gig in 2013.

Scott Sizemore (knee) is with the Athletics on their road trip and has been taking batting practice and fielding grounders every day.

Sizemore, who had ACL surgery back in March, had already resumed hitting last month. "It's a beautiful thing," he said. He's expected to be 100 percent for spring training next year.

Scott Sizemore (knee) has resumed hitting activities.

Sizemore hit off a tee Monday for the first time since landing on the disabled list. This doesn't change his timeline, and he still won't return this season. However, he should be 100 percent for spring training next year.

Scott Sizemore underwent successful surgery on his left knee Wednesday morning.

Sizemore was expected to open the season as the A's starting third baseman, but he tore the ACL in his left knee early in camp and has been ruled out for the entire 2012 season. However, he's fully expected to be ready for spring training next year.

Athletics placed 3B Scott Sizemore (torn ACL) on the 60-Day disabled list.

The move clears a spot on the 40-man roster for Yoenis Cespedes, who officially agreed to terms with the Athletics on Saturday. Sizemore had previously been ruled out for the 2012 season and is set to undergo surgery in 2-3 weeks. Josh Donaldson replaces him in the lineup.

Scott Sizemore plans to undergo surgery to repair the torn ACL in his left knee in 2-3 weeks.

Sizemore, who was expected to start at third base for the A's, has already been ruled out for the 2012 season. Josh Donaldson will get first crack at replacing him.

Scott Sizemore suffered a torn ACL in his left knee and will miss the entire 2012 season.

Brutal news for Sizemore, who played well after being acquired from the Tigers last season and was set to serve as the A's starting third baseman in 2012. The 27-year-old will be reevaluated in two weeks before a date is set for surgery. The A's will likely look at Josh Donaldson, Adam Rosales, Eric Sogard and Wes Timmons as possible replacements at the hot corner.

Scott Sizemore will have an MRI exam on his left knee Monday.

Oakland thinks the knee is sprained. "We're holding out hope for good news," A's manager Bob Melvin said. "If ever there was a time to have (the injury), it's early in camp to be able to recover from that." Adam Rosales, Eric Sogard Wes Timmons and Josh Donaldson are expected to compete at third base in his absence. Depending on whether or not Sizemore's ligaments were torn, the recovery time could range anywhere from four to six weeks.

Manager Bob Melvin said the injury sustained to Scott Sizemore on Saturday is a ''left knee sprain.''