Detroit will play Baltimore in Sarasota, Fla., on Wednesday.
"Last year was [about] the actual ground-ball catching," Castellanos said, per MLB.com. "This year is a lot more [about] quickness, working on my range, lateral movement."
On top of committing 15 errors, Castellanos' Ultimate Zone Rating of negative-18.4 was nearly twice as bad as the next-lowest rating among third-base regulars. He also had a Defensive Runs Saved of minus-30 and a plus/minus rating of minus-39, which was lowest in the majors last year.
"I'm going to be more comfortable this year," Castellanos said. "Last year, I knew nobody [in terms of hitting tendencies]. Also I was getting used to the tempo of the game. It wasn't like I was in the big leagues for a while at another position and then had to go to third base. It was pretty much me making my first year in the big leagues at pretty much a new position, or trying to relearn an old position."
Castellanos committed 15 errors and had a .950 fielding percentage in 145 games at third base in 2014.
"His hands are solid and his arm is solid," Dombrowski said, per MLive.com. "He normally catches what he gets to, but we're looking to increase his quickness over there.
"There's no question, from a defensive perspective, that he needs to improve. But when I say that, we try to give him the benefit of the doubt. He hadn't played third base in a while."
Dombrowski also has confidence in Castellanos' offensive abilities after he hit just .259 with 11 home runs as a rookie.
"We think he has a chance to be a good offensive player," Dombrowski said. "He had a good solid year last year, and we think he's going to continue to get better. When you look at his numbers for a rookie, and in a pennant race, his offensive numbers were pretty good."
The third baseman was a late scratch Tuesday due to soreness in his left foot, but the issue appears to have been minor. Castellanos has hit .266/.313/.405 with 10 home runs and 60 RBI in 496 at-bats.
|CBSSports.com Player Ranking|
|10/5/2014 vs Baltimore|
|vs Gibson (Career)||9||1||0||.111||.200||.111|
|Last 7 Games|
|Complete Game Log|
| 5 || 6 |
| 7 || 8 |
| 9 |
| 10 |
| 12 |
| 13 |
| 14 |
| 15 |
| 16 || 17 |
|More Batting Stats|
|Postseason Batting Stats|
|Minor League Batting Stats|
|2011||AFX-West Michigan Whitec||135||507||65||158||36||3||7||76||45||130||3||2||.367||.436||.312|
|2012||AFA-Lakeland Flying Tige||55||215||37||87||17||3||3||32||22||42||3||2||.461||.553||.405|
|2013||AAA-Toledo Mud Hens||134||533||81||147||37||1||18||76||54||100||4||1||.343||.450||.276|
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