"Kukors claims that Hutchison started (in 2002) the process of child 'grooming,' a practice utilized by child predators to obtain a victim's trust with the goal of sexualizing the relationship," according to a statement from her attorneys.
In a statement he released last month, Hutchison, 46, said everything he did with Kukors was consensual. They had a "committed relationship" after the 2012 Olympics that lasted more than a year, he said.
"I absolutely deny having any sexual or romantic relationship with her before she was old enough to legally make those decisions for herself," he said in the statement. "Prior to that time, I did nothing to 'groom' her."
"I deeply regret that she would make these wild allegations all these years later."
Kukors won a world championship and was a world record-holder in the 200-meter intermediate medley. She also won a world title in 2010 in the short-course 100-meter intermediate medley. Kukors swam for the United States in the 2012 Olympics in London, CNN reported.
Hutchison was the head coach of the U.S. women's swimming team in 2009 and also was one of the Olympic coaches in 2008 at the Beijing Games.