ST. LOUIS -- One of several slumping Reds hitters, third baseman Scott Rolen took a .121 average into Tuesday's series opener against the Cardinals. The team's cleanup hitter, he was 2-for-16 with five strikeouts in the previous four game series against the Nationals.

Rolen led the club in hitting during Spring Training with a .356 average. Last season, when he struggled with a .242 average and five home runs in only 65 games, he was playing with an injured left shoulder. This early-season slump is not related to a health issue, however.

"He looks healthy. He left Spring Training healthy," manager Dusty Baker said. "He really hasn't done anything not to be healthy. He's just getting off to a slow start. It's all over baseball, these slow starts. When he left Spring Training, he was swinging great."

Frazier summoned as Cairo goes on DL

Top Prospects: Todd Frazier, 3B/OF Reds

ST. LOUIS -- The Reds placed utility infielder Miguel Cairo on the 15-day disabled list Tuesday because of a strained left hamstring. Versatile infielder Todd Frazier was recalled from Triple-A Louisville ahead of their series opener against the Cardinals.

Frazier took a flight on Tuesday morning from Cincinnati to St. Louis to meet the club.

"It always feels good to get the call," Frazier said. "Sooner or later, it doesn't matter to me. I'm just getting up here and bringing a little energy to the team. It's go time. I will help the team out as much as I can."

Cincinnati had been shorthanded since Cairo was hurt during Saturday's game against the Nationals. Second baseman Brandon Phillips only returned on Sunday after missing five starts because of a sore left hamstring, and he still isn't at 100 percent.

"He was a little bit improved, but we just couldn't wait and play short," Reds manager Dusty Baker said of Cairo. "We were playing short for almost a week with Brandon. We just couldn't afford to go short again for another six days, maybe. And his was a little worse than Brandon's."

The 26-year-old Frazier was the final roster cut out of Spring Training. He was brought back after the team left Arizona only to be cut the day before Opening Day in a tough move when Cincinnati added pitcher Alfredo Simon in a waiver-wire pickup.

"At first, you didn't really know how to take it. At the same time, you understood that it happens for a reason," Frazier said. "That's the main thing I was thinking about. I worked on some stuff. I got off to a slow start, but I started turning it on at the end there in Triple-A. I'm feeling great at the plate now. We'll see what happens."

Frazier, who hit .291 with a team-leading five homers and 15 RBIs during camp, got off to a slow start with Louisville and was batting .231 overall. He also missed two games with a hyperextended elbow. But he has recovered well and has a five-game hitting streak during which he went 6-for-18 with a home run.

With the exception of Sunday when he played left field, Frazier has only played third base for Louisville. He can also play first base, second base and shortstop.

Worth noting

• Reds reliever Nick Masset, out since Spring Training with a sprained right shoulder, had a setback in his effort to return. Masset was shut down after one throwing session because of tenderness in his shoulder. Not considered a major issue, he will rest for a few days before trying to resume.

• Right-handed reliever Jordan Smith was reinstated from the 15-day disabled list and optioned to Triple-A Louisville on Tuesday. Smith, who missed most of Spring Training, with a sore right elbow, had been rehabbing in extended spring training in Goodyear, Ariz.

• The order for the 2012 First-Year Player Draft was announced Monday. The Reds have the 14th pick in the first round. They also have the 49th (Type B compensation for Ramon Hernandez), 57th (Type B compensation for Francisco Cordero), the 78th, 109th and 142nd picks. The Draft, which begins with first-round coverage on June 4 at 7 p.m. ET, will now be 40 rounds instead of 50.