• Ledecky beats McIntosh for another stunning win
• France’s Marchand makes return to competition
• USA’s Casas wins 100m freestyle, 50m backstroke

US freestyle great Katie Ledecky posted the second-fastest 400m free time of her storied career on Thursday, clocking 3min 56.81sec to run down Summer McIntosh for a second stunning victory in as many days at the TYR Pro Swim Series meeting in Florida.

Ledecky, who posted the second-fastest 1,500m free time in history on Wednesday, overshadowed the return to action of Paris Olympic star Leon Marchand, who posted a personal best in finishing third in the men’s 400m free in his first competition in four months.