CANCUN, Mexico - Abby Wambach scored three times, twice in the first half, and helped out on another to pace the three-time defending champion United States to a 5-0 victory over Haiti Thursday night in the opening game for both at the CONCACAF Women's World Cup Qualifying.Rachel Buehler scored her first career international goal less than nine minutes after the opening kickoff and Amy Rodriguez also scored, overwhelming a Haiti team that struggled to hold possession in the American half and didn't manage a shot on goal until the 37th minute.The United States improved to 24-1-0 in the CONCACAF women's championship and won its 17th straight in World Cup qualifiers.For the Haiti, which is still dealing with the after effects