Tryouts -- Orioles scouts will be at Camden Yards on Saturday to sign men and women ages 18 and older who are interested in serving as ballboys and ballgirls during the 2007 season. An open tryout will be held at noon at Oriole Park in Baltimore. Candidates, who should be able to handle a baseball glove and field ground balls, should dress casually, take their gloves and use the Home Plate Plaza entrance to Camden Yards on the southwest corner of the ballpark. Candidates must be customer-service-oriented and be available to work the whole season. Free parking is available in lot A. 410-547-6150.