By RON SNYDER ,Staff Writer Both Archbishop Spalding's boys basketball team and St. Mary's girls team are entering transitional periods in their respective programs. Spalding comes into the 2005-2006 school year looking to replace three Division I-bound graduates in point guard Justin Castleberry (Bucknell), shooting guard Marquis Sullivan (Loyola), and Lawrence Dixon (Holy Cross). The trio combined for about 45 points per game. St. Mary's is also looking to replace three top players, including the program's centerpiece the last four years in Mount St. Mary's-bound point guard Bri Gauthier. However, the two programs showed the ability to reload as both schools came up with wins yesterday in the county summer league championship at Severna Park Middle School. Spalding, a perennial MIAA A Conference championship contender, capped its 11-0 league season with a 47-37 win over a young, athletic Arundel squad. St. Mary's (9-1), which advanced to the title game a day after a double-overtime win over Spalding, rallied to defeat Old Mill, 37-35. "The goal of playing in this league is to get all of our guys into the mix, which has been tough with guys playing AAU ball, or baseball this summer," said Spalding assistant Sean Whalen, who is coaching the team while regular season coach Mike Glick watches from the sidelines. "This is a chance to get a lot of guys into situations where they are involved in big-game situations but not until crucial moments like in the regular season." Senior guard Derek Young led Spalding yesterday with 15 points while making the transition from small forward this year. The Cavaliers also got 12 points from Kevon Moore, a 6-foot-2 sophomore who is expected to start at shooting guard this year. Moore led the junior varsity team in scoring last year and has the ability to be one of the best guards in the area. Glick said this team compares to his 2001-2002 squad with Young playing the role of current Mount St. Mary's guard Landy Thompson with the rest of the roster young, but athletic. The roster includes four seniors in center Danny Quinn, and guards Matt Cassilly, Danny Palumbo and Young. Among the youngsters expected to produce is junior guard Nick DeSouza, who did not play last night but should back up Young during the regular season. "The chemistry on this team will be fantastic," said Glick, who has produced 12 Division I players since arriving at Spalding in 1999. "This may be one of the best defensive teams I've coached here. We are going to run more, play man-to-man defense much better and be much better in transition than last year." Young said playing in the summer league was the best way to help him develop his on-court leadership style as the team's point guard. "This has been a great learning experience this summer," Young said. "I thought making the move would be easy, but it wasn't. The pressure is always on you to get your team involved." Arundel coach Sam Golder said he couldn't be more pleased with how his team performed this summer, especially since the Wildcats have just three players on their roster - guard Austin Miller, forward Justin Kondos and center Jake Eastep - with varsity experience. Eastep led the team with 10 points yesterday, while Alex Erhard had nine points and Miller and Ray Hill finished with six each for Arundel (7-3), which pulled within 41-35 late in the second half. "This is a very coachable group that had a great year on JV last year," said Golder, who stepped down as the team's coach to become a school administrator. "They were feisty tonight and gave Spalding all they could handle."