Derek Jeter took another step Monday toward his stated goal of being ready for Opening Day when he worked out on a baseball field for the first time since breaking his left ankle during the playoffs. Jeter hit in the batting cage at the Yankees' minor-league complex in Tampa and also took 55 ground balls. He did not run and won't until sometime during spring camp, which starts next month. "Everything went well," Jeter told an Associated Press reporter after the workout. "He's fine, he's healthy and it's now about knocking the rust off in a systematic way," GM Brian Cashman told the Daily News in a telephone interview. "It's the next step in the process. There's no worries or concerns with him; he's just closing the gap between now and opening day, just taking it through slowly.