33 | Casper Wells, OF

Age: 27. HT: 6-2. WT: 210.

Bats: Right.

Best case: He hits at least 25 homers after getting a shot to play every day, making the deal that sent Doug Fister to Detroit seem like a push.

What's likely: He will hit .260, with 10 homers and 30 runs batted in during spot duty.

61 | Munenori Kawasaki, INF

Age: 30. HT: 5-10. WT: 165.

Bats: Left.

Best case: Kawasaki, who hit well this spring, continues to hit with authority in the regular season while being able to play more than one position.

What's likely: Kawasaki will be a reliable utility player, hitting about .270.

* Japan statistics

27 | John Jaso, C

Age: 28. HT: 6-2. WT: 205.

Bats: Left.

Best case: He returns to the hitter he was in 2010 with the Rays, when he had an on-base percentage of .372.

What's likely: He will be fine as a backup catcher, and would be serviceable full-time if Miguel Olivo gets injured.

20 | Mike Carp, LF

Age: 25. HT: 6-2. WT: 210

Bats: Left

Best case: Carp progresses even further after a strong second half last year, hitting around .300 with 20 to 25 homers and 85 to 90 runs batted in.

Worst case: Carp, who slumped in September last year (hitting .230), can't make good on the promise he showed for most of the second half of the season, falling into a platoon with Casper Wells.

What's likely: Carp, who was the Mariners' most productive hitter after returning from the minor leagues in mid-July, solidifies himself as the team's everyday left fielder by hitting around .290, with 15 to 20 home runs. Note: Carp suffered a shoulder injury during the Mariners' opener in Japan and was placed on the 15-day disabled list. He was expected to be the starting left fielder.

21 | Franklin Gutierrez, CF

Age: 29. HT: 6-2. WT: 190.

Bats: Right.

Best case: He misses less than a month after starting on the disabled list and has a breakout season offensively.

What's likely: His defense isn't to the level it was in the 2009-2010 seasons and health issues continue to derail his offensive progress.