The competition held at the Tokyo Aquatics Center in Koto-ku, Tokyo, is held to select representatives for the Paris Olympics. On the first day of the tournament, there was no official offer to represent the team, and all eyes will be on whether there will be a first official offer on the 18th.
The hotly anticipated women's 100m butterfly final is likely to be a battle centered around Rikako Ikee, who holds the Japanese record. In the men's 400m individual medley, Daiya Seto, who won the bronze medal in this event at last month's World Championships, and 18-year-old Tomoyuki Matsushita are also aiming.