The Winchester boys and girls lacrosse teams begin MIAA tournament play this week.The boys team is seeded second in Division 2 North at 13-5 and will play on Saturday, June 4 (5 p.m.) against either seventh-seeded Marblehead (9-9) or 10th-seeded Northeast Metro Tech (10-10).The Sachem girls will visit Middlesex League rival Woburn at 4 p.m.