COTTAGE GROVE — Even with only three seniors on its roster, the Sutherlin girls basketball team looks like a contender for the Class 4A state championship in the early stages of the 2012-13 season after finishing second behind Henley of Klamath Falls last year. Sophomore guard Miranda Mendenhall scored 24 points — 10 coming in the first quarter — to lead the unbeaten Bulldogs to their 12th straight win, a 63-39 rout of Cottage Grove Saturday in the championship game of the Cottage Grove Holiday Tournament. “So far, so good,” said Sutherlin coach Josh Grotting. “We’re young, but our sophomores …