The Cincinnati Reds say closer Aroldis Chapman will stay in that role.

The Reds set their rotation on Friday and Chapman isn’t included. He came to camp with the possibility of becoming a starter, but will remain in the bullpen for the NL Central champions.

Johnny Cueto will start on opening day at home against the Los Angeles Angels on April 1. He will be followed in the rotation by Mat Latos, Bronson Arroyo, Homer Bailey and Mike Leake.

Chapman had 38 saves in 43 chances last season. The hard-throwing left-hander became the closer on May 20 and later converted a team-record 27 consecutive saves.

Cueto will be the opening day starter for the second year in a row. He won a career-high 19 games last season.

METS: As expected, left-hander Johan Santana will start the season on the disabled list while he works to strengthen his pitching shoulder.

The 33-year-old Santana hasn’t pitched in a spring training game this year.

“He’s not going to open with us,” New York Manager Terry Collins said. “He’s going to have to get himself ready and that’s going to certainly determine on a daily basis where he’s at, but we’ll be gone. I’ll have to monitor him by the phone.”

PADRES: Right-hander Casey Kelly will have Tommy John surgery on his pitching elbow the first week of April.

San Diego General Manager Josh Byrnes confirmed that plan Friday morning.

Kelly is expected to miss 12 to 18 months rehabbing after the procedure.

DIAMONDBACKS: Outfielder Adam Eaton will be out for up to two months with a left elbow sprain.

Arizona General Manager Kevin Towers said Eaton had an MRI exam that revealed a small tear in the fibers around the ulnar collateral ligament. Eaton had been bothered by a sore elbow for a couple of weeks.

Towers said Eaton, expected to be the Diamondbacks’ starting center fielder and leadoff hitter, will be shut down for four weeks and the best-case scenario for his return would be in six weeks, but it could be as long as two months.

TWINS: The team put left-hander Scott Diamond on the 15-day disabled list as he continues his recovery from arthroscopic surgery on his pitching elbow.

Diamond is projected as one of the team’s top starters this season after going 12-9 with a 3.54 ERA last year.

The Twins also announced right-hander Anthony Swarzak was put on the 15-day DL as he recovers from rib fractures.

ROCKIES: Jhoulys Chacin, who is slated to start for Colorado on opening day, was scratched from a split-squad start against Texas because of back spasms.

Chacin pitched for Venezuela in the World Baseball Classic and has been limited to 41 / 3 innings in three Cactus League starts this spring. He reported the back problems on Thursday and the Rockies decided to start Tyler Chatwood against the Rangers on Friday in Surprise, Ariz.