The Groton football team won its third successive annual victory over St. Mark's at Southboro yesterday by a score of 35 to 0. St. Mark's was completely outclassed, but in the first half, by stubborn defense near the goal line, held Groton down to twelve points. In the second half, however, Groton scored four times, St. Mark's being unable to resist the superior weight and cleverly executed tricks of her opponents. St. Mark's, on the other hand, was unable to gain through Groton's strong line and was usually thrown back for a loss. The features of the game were two long dodging runs by Starr, the Groton quarterback.