Don't start fitting shortstop Starlin Castro for a Gold Glove just yet.

Even though the defensively challenged Castro has made improvements this spring, manager Dale Sveum said it's tough to make a fair assessment one way or the other.

"I think it's too small of a sample,'' Sveum said Sunday. "The games he's played, he hasn't really gotten a lot of action, so it hasn't been a good-enough sample to tell yet, but he's been working better. He's cleaning up a few things, but it's still a process on an every-day basis.''

Castro had 27 errors as a rookie in 2010 and 29 errors last season.

Lack of concentration has been his biggest issue.

"The only downside from him last year was his focus,'' former teammate Aramis Ramirez said Saturday. "That's why he made a lot of errors. That happens to everyone, but he's going to get better.