SEATTLE -- It remains to be seen if noted slugger Wily Mo Pena can translate his tremendous power into game situations and establish a role with the Mariners, but the veteran wasted no time blistering some impressive batting practice blasts Saturday after saying he's hitting better than ever in his baseball career.

Pena, 29, has bounced around the Minor Leagues for most of the past three seasons, but the 6-foot-3, 230-pound Dominican remains an intriguing prospect for a Seattle club seeking some offensive punch.

Pena was selected from Triple-A Tacoma on Saturday after first baseman Justin Smoak went on the 15-day disabled list and was immediately inserted in the starting lineup at designated hitter Saturday night against the Red Sox.

He was slotted in the fifth spot and went 0-for-4 with a pair of strikeouts in the Mariners' 5-4 win.

Pena hit 25 home runs in 76 games between Reno and Tacoma in the Pacific Coast League and five in 17 games with the D-backs in a brief stint in the Majors this season.

"I think this is my best year," Pena said. "I said to myself, like wine, when they're old, they taste better. I'm getting old, I think I've learned how to hit. It feels so good. This year, I'm hitting like I never have in my life. I was impressed with myself. I just have to do the same thing I was doing down there. Keep doing it here. Like I was helping the teams down there, do the same thing up here."

That would be a welcome scenario for the Mariners, but it should be noted that Pena has never quite panned out as expected since hitting 26 home runs for the Reds in 2004 and then .301 in 84 games with the Red Sox in '06.

He has a .251 average and 82 home runs over 577 career games with the Reds, Red Sox, Nationals and D-backs in parts of eight seasons, but was released by Arizona after batting just .196 in 46 at-bats earlier this season.

"He has tremendous power and some big league experience," Mariners manager Eric Wedge said. "We've got him in there tonight and will primarily use him in the DH role when he is in there. We still want to mix and match guys."

The right-handed Pena is one slugger who shouldn't be intimidated by the size of Safeco Field. He's not the type of hitter who has to worry about park dimensions.

"Yeah, I think that's fair to say," Wedge said with a smile. "He has a tremendous amount of power. Balls look different off his bat."

Pena reached well into the upper deck in left field during his initial batting practice. Now the key is translating that into games. And, no, he isn't worried about Safeco's tough reputation for right-handed hitters.

"I knew that was coming," he said, laughing, when asked about Safeco. "I know it's a big park. Everyone was saying, 'Oh, it's not a big park for you.' I'm not worried about a big park. I'm just worrying about being comfortable and doing the simple things to help the team.

"I'm not thinking I have to hit a home run. No. That will come. When I was down [in the Minor Leagues], they have some big parks. I just tried to make contact. If I make contact, something will happen."

Red Sox manager Terry Francona well remembers Pena's long-ball prowess from his two seasons in Boston, where he hit 16 home runs in 2006-07.

"It's silly," Francona said. "Wily Mo's power is off the charts. He hit a ball in Baltimore, it won the game for us. By the eighth inning it was a day when the wind was blowing and he hit it left-center. I couldn't imagine someone hitting a home run that day.

"He hit a homer in Kansas City that almost hit the concession stand. I mean, his power was just unbelievable. ... There were a lot of misses in there, too."

For his part, Pena just wants a chance to play and show what he can do to bolster a Seattle offense that ranks last in the Majors in scoring.

"It's an opportunity," he said. "I know they have great team. Some things aren't working the right way, but it's not going to be like that the whole year long. Hopefully it will change. It's going to start tonight. It's a different day, the past is the past. Now we have to start doing it from now on. I just want to help."

Mariners place Smoak on DL, call up Pena

SEATTLE -- Mariners first baseman Justin Smoak, who took a bad-hop ground ball off his face on Friday night, was placed on the 15-day disabled list Saturday, and the team selected veteran Wily Mo Pena from Triple-A Tacoma to take his place on the 25-man roster.

Left-handed pitcher Luke French was designated for assignment to create room for Pena, who was not on the 40-man roster after being signed by Seattle in late July.

Smoak suffered a broken nose and hairline fracture on the cheek bone right below his left eye on a hard smashed ball by Boston's Jarrod Saltalamacchia in the second inning of Friday's game.

Smoak was seeing another doctor for a second opinion on Saturday evening and manager Eric Wedge said no timeline would be available on his return until after that. But initial X-rays revealed a non-displaced fracture of the nose and a CT scan also showed the hairline fracture of the maxilla bone in his left cheek.

"I was hopeful it was just the nose, but it's a little bit more than that," Wedge said. "He's got a fracture underneath the eye, too. The good news is it's nothing too serious, but we'll still have to give him some time."

Smoak, 24, is expected to be fully sidelined for three to five days before he can begin playing catch and taking batting practice. Wedge said he wasn't certain if the big first baseman would need to wear a protective mask over the cheek and nose.

"I don't know yet. That will be part of the timeline," Wedge said. "We don't want to do anything risky, obviously. I think we all agree with that. So we'll have to see how it plays out in regard to what the doctor says [Saturday night] as well as what we've already heard."

French, 25, was 8-8 with a 6.12 ERA in 23 starts for Tacoma this season. He previously pitched parts of two seasons with the Tigers and Mariners, going 9-12 with a 4.99 ERA in 31 games.

Mariners sign fifth-round Draft pick Marlette

SEATTLE -- The Mariners signed catcher Tyler Marlette, their fifth-round pick out of Florida, on Saturday as they continued working toward Monday's deadline for 2011 Draft picks.

Marlette, 18, hit .473 with six home runs as a senior at Hagerty High School in Oviedo, Fla.

Marlette was the Most Valuable Player in the 2010 Aflac All-American game after hitting a two-run home run estimated at 370 feet over the left-center-field fence at PETCO Park in San Diego. He was rated by Baseball America as the 72nd overall prospect heading into June's First-Year Player Draft.

"Tyler is a high-profile catcher with a strong and accurate arm," Mariners scouting director Tom McNamara said. "He has quick hands and a short, compact speed swing. We are excited to have him part of the organization."

Marlette will report to the Pulaski Mariners, Seattle's rookie affiliate in the Appalachian League.

The Mariners have now signed 39 of their 51 selections. Among those unsigned are their first three picks, including first-rounder Danny Hultzen, the Virginia pitcher who was the second overall selection in the Draft. The deadline to sign players with remaining college eligibility is 9 p.m. PT on Monday.