Rochester Mayo was perfect in its title defense, winning every match this fall, capped by a 4-3 victory over Edina in the Class 2A championship Wednesday. The Spartans earned it the hard way, winning a pair of 4-3 matches at Baseline Tennis Center. In their semifinal victory over fourth-seeded Maple Grove, it was a singles sweep that powered the Spartans through, with Claire Loftus, Aoife …