RIO DE JANEIRO - Swimming's "Iron Lady" Katinka Hosszu showed her affinity towards another metal on Monday, when she mined a second gold at the Rio Olympics.

The Hungarian clocked 58.45 seconds to win the 100m backstroke - two days after winning the 400m individual medley in a world record time.

"I was relaxed," said Hosszu. "I've trained hard for four years so I could come to Rio and feel it's second nature."

American Kathleen Baker took silver (58.75sec) at the Olympic Aquatics Stadium. Canadian Kylie Masse claimed bronze (58.76sec).