CINCINNATI — The price tag for Mat Latos was daunting. The Cincinnati Reds were willing to pay it.

The Reds addressed their biggest offseason need on Saturday, acquiring the right-handed starter from San Diego for a package of four players that includes two top prospects.

Cincinnati gave up infielder Yonder Alonso and catcher Yasmani Grandal — both first-round picks — along with starting pitcher Edinson Volquez to get the 24-year-old Latos, who initially will move into the No. 2 spot in the rotation behind Johnny Cueto. Latos went 9-14 with a 3.47 ERA for the Padres last season, finishing among the NL leaders in ERA and strikeouts.

The trade surprised Latos, who said the Padres had indicated to him that he wouldn’t be going anywhere.

“A little bit of shock and a little bit of excitement,” Latos said, describing his reaction. “Shock because literally I wake up and I’m traded. Excitement because I’m excited to join a club that’s got a lot of talent and a lot of potential. I’m excited for new scenery.”

The Reds wanted him so badly that they were willing to give up a lot.

“To acquire a pitcher who is ready to fit into the top of a rotation, you have to give up talent,” general manager Walt Jocketty said.

Latos joins a rotation that includes Cueto, Bronson Arroyo, Mike Leake and Homer Bailey. The rotation was a problem last season, with Cueto opening the season on the disabled list and Arroyo struggling with mononucleosis that he contracted during spring training.

Heading into the offseason, the Reds needed to get another top starter and a closer to replace departed Francisco Cordero. They think they’ve filled their first need.

“When we have Cueto and Latos at the top of our rotation, I think people are going to take notice,” Jocketty said.

Latos tied a major league record by allowing two or fewer runs in 15 consecutive starts in 2010. Last season, he held right-handed batters to a .204 average and made 20 quality starts, tied for most on the Padres, who like their pitching depth.