Katie Ledecky posted the fifth-fastest 1,500-meter freestyle time in history in winning the gold medal at the swimming world championships in Singapore on Tuesday.

Katie Ledecky has ceded a tiny bit of ground in other events, but she’s still unbeatable in the 1,500-meter freestyle.

Katie Ledecky cruised to a dominant 1 500m freestyle gold in Singapore on Tuesday to claim the 22nd world title of her ...