WRENTHAM Marri O’Connell proved at Saturday’s Div. 2 State cross country Championships that she has mastered the Wrentham Developmental Center’s 5K layout. Racing in chilly conditions on the rolling, sun-splashed course, the Marblehead sophomore built a 50-yard lead with a 5:33 opening mile and was never challenged. She was alone at 2-miles (11:38) and […]