Australian swimmer Ariarne Titmus defended her women’s 400-metre freestyle gold at the Paris Olympics on Saturday, while American superstar Katie Ledecky had to settle for bronze. Titmus set the fastest time of 3 minutes 57.49 seconds to defeat Canada’s Summer McIntosh by 0.88 seconds. Ledecky was 3.37 seconds away from her gold medal dream. “It’s a little bit more emotional, this one, than the first one. I know what it feels like to be an Olympic champion. It’s a different feeling. I know how hard it is racing in these circumstances, at an Olympic Games. The noise, atmosphere, pressure,” Titm…