Last year at this time, Topsham’s Caleb Manuel was preparing for the Downeast Metro Amateur Golf Tournament at the Bangor Municipal Golf Course and Bar Harbor’s Kebo Valley Golf Club. He has a bigger tournament to prepare for this year: the U.S. Open. The 20-year-old Manuel, who plays for the University of Connecticut, shot a three-under-par 137 over 36 holes at two golf courses in New York during Monday’s qualifier to earn a spot in the championship, which will be held on June 16-19 at The Country Club in Brookline, Massachusetts. “It hasn’t sunk in yet,” said the former Mt.