Chris O'Meara/Associated Press
SP Chad Billingsley, Los Angeles Dodgers (Tommy John surgery)
It's easy to forget just how good Chad Billingsley was, as he went 73-57 with a 3.65 ERA from 2007-12. He made just two starts last season, though, before undergoing Tommy John surgery on April 25, and he's been recovering ever since.
He began throwing off a mound earlier this week, and he could return by late May, according to Ken Gurnick of MLB.com.
SP Matt Harvey, New York Mets (Tommy John surgery)
What was a breakout season for Matt Harvey ended abruptly when he was sidelined in late August with what was originally called a UCL sprain and resulted in Tommy John surgery on Oct. 22.
He is scheduled to start throwing for the first time since the surgery on Feb. 22, according to Dan Martin of the New York Post. In an interview with WFAN radio last week, Harvey said the he is eyeing a September return and is hoping he can get his feet wet before then in order to have a normal offseason next winter (h/t Adam Rubin of ESPN New York).
"I think for me it would be important to be out there," Harvey said to WFAN. "Whether I throw a couple innings in September or not and then have a normal offseason where I can go in and know I got some hitters out, struck a few guys out, and get back out there."
SP Derek Holland, Texas Rangers (Knee surgery)
Derek Holland gave the Rangers a solid No. 2 starter behind Yu Darvish last season, going 10-9 with a 3.42 ERA in 213 innings of work, but a freak knee injury this offseason landed him on the sidelines.
An incident involving his dog ended in microfracture surgery in January to repair torn cartilage behind his left kneecap, according to Matt Snyder of CBS Sports. He's expected to be out until midseason, leaving the Rangers to count upon another injury-returnee in Colby Lewis to fill out the rotation.
SS Derek Jeter, New York Yankees (Ankle surgery)
Myriad leg and ankle injuries limited Derek Jeter to just 17 games last season, but the Yankees are counting on a healthy Jeter to be their everyday shortstop again this year.
All signs point to him being healthy for the start of the season, and according to Anthony McCarron of the New York Daily News, it's been a normal offseason for the 39-year-old.
CF Matt Kemp, Los Angeles Dodgers (Ankle surgery)
After falling just one home run short of a 40/40 season in 2011, Matt Kemp has been limited to just 179 games over the past two seasons while dealing with injuries.
A left ankle sprain kept him sidelined for most of last summer, and he underwent surgery on it this offseason. According to Dylan Hernandez of the Los Angeles Times, his status for Opening Day is up in the air at this point, and he has no plans of rushing back and risking another injury.
3B Manny Machado, Baltimore Orioles (Knee surgery)
Manny Machado suffered a gruesome knee injury last September when he stepped awkwardly on first base trying to leg out a ground ball.
He was cleared to begin easing back into baseball activities on Jan. 31, according to Brittany Ghiroli of MLB.com. As things stand, he's well ahead of schedule just four months removed from the surgery, and he should be ready to go by Opening Day or shortly thereafter, barring a setback.
1B Mark Teixeira, New York Yankees (Wrist surgery)
A torn tendon sheath in his right wrist sidelined Mark Teixeira during the World Baseball Classic last spring, and after originally opting for rest and returning for 15 games in June, he re-injured the wrist and underwent surgery on it in July.
He's still working to get back to 100 percent, but he should be ready to go by Opening Day, as long as it continues to improve, according to Bryan Hoch of MLB.com.
SP Justin Verlander, Detroit Tigers (Abdominal surgery)
Justin Verlander injured his core doing squats back in December, and what began as discomfort on his left side ended in surgery on his right side.
He threw off a mound for the first time since the surgery on Monday and expects to make five spring starts in order to be ready to go for the start of the season, according to ESPN.