Hall of Famer Robin Yount started his career as a shortstop and committed 44 errors in his second season. He followed that with seasons of 31, 26, 30, 25 and 28 errors. Yount was 18 years old when he broke into the majors, having played only rookie ball before joining the Milwaukee Brewers. Cubs shortstop Starlin Castro might not equal Yount's achievements, but his career is starting out the same. ''There aren't too many shortstops who are 19, 20 or 21 years old who have had outstanding starts to their careers defensively,'' said Cubs manager Dale Sveum, who also was a shortstop. ''It's a matter of understanding and learning from those errors that there's a lot of work to do. It's a process when you're dealing with a young guy. It's not Internet coaching.''