She won her heat in the women's 100 metre breaststroke event, with a time of 1:21.68, but finished 47th overall and did not advance.
English Zoë Baker set a world record in the 50 metre breaststroke.
She is an all-rounder competitor but specializes in the 100 and 200 metre breaststroke.
American Rebecca Soni set a world record of 2:19.59 to win the women's 200 metre breaststroke final.
She competed at the 1996 Summer Olympics in the women's 100 metre breaststroke.
In the 1908 Olympics he won a silver medal in the 200 metre breaststroke.
Tateishi subsequently won a bronze medal in the 200 metre breaststroke.
He competed in 100 metre breaststroke, where he finished 16th.
Four years later he competed in the 400 metre breaststroke and won a bronze medal.
He also competed in the 200 metre breaststroke and was fourth.