Zayak was coached jointly by Peter Burrows and Marylynn Gelderman throughout her amateur and professional career. She won gold at the 1979 World Junior Championships. The next season, she began competing on the senior international level. Zayak stood atop the podium at the 1979 Skate Canada and Prague Skate and then appeared at her first senior World Championships. She was included in the first trip to China by American skaters, in 1980.