At the 1999 American Classic and Pan American Trials, Antolin was fourth in the all-around. At the Pan American Games in Winnipeg, she helped the U.S. win silver in the team competition. At the World Team Trials, she finished second in the all-around. She was named to the World Championships team, and at the 1999 World Artistic Gymnastics Championships in Tianjin, she helped the U.S. finish sixth.