By Eamon Convey @EJConvey MEDFIELD -- It was a competitive battle between No. 3 Medfield and No. 18 Dover-Sherborn in Tri-Valley League action on Friday night, but it would be the Warriors who would prevail at home 12-9 to remain atop the league standings. Medfield was paced by Jack McCordic, who scored six goals and assisted on another, along with a strong team defensive effort, led by John Schofield, down the stretch. Tim Polk and Pierce Gregory stood tall for D-S offensively in the loss.