A man who claims he is romantically involved with Martina Hingis was arrested and charged with stalking her at the Ericsson Open in Key Biscayne, Florida.

Dubravko Rajcevic, 45, had been following Hingis and sending her letters, her coach and mother, Melanie Molitor, told police. He was charged with stalking and trespass after warning, both misdemeanors, and released on Friday on $1,000 bond.

Rajcevic told Miami's WPLG-TV that he and Hingis have a relationship.

"I'm not stalking Martina," he said. "I believe she feeds off my positive energy. She knows me well."

Hingis, 19, who will play Lindsay Davenport in the final on Saturday, declined to comment.

Rajcevic has followed Hingis at other tournaments, Molitor told police. He has an Australian passport and was staying at a hotel in downtown Miami.

When Rajcevic was seen at the tournament on Wednesday, police told him to leave and warned him not to return. He was spotted at the tournament again on Thursday and arrested, police said.