Yasuhiro Koseki blew away the field to win the men's 200-meter breaststroke at the national swimming championships on Saturday.

Koseki touched the wall at Tatsumi International Swimming Center in 2 minutes, 7.77 seconds and along with runnerup Ryo Tateishi (2:09.54) passed the event's qualifying standard for a spot in this summer's swimming world championships in Kazan, Russia.

It was Koseki's second title after also winning the 100 breaststroke.

Ryosuke Irie captured the men's 200 backstroke title in 1:54.93 to follow his triumph in the 100 backstroke. Irie and Masaki Kaneko, who came second in 1:56.70, booked berths for the worlds.

Natsumi Hoshi punched her ticket in the women's 200 butterfly in a winning time of 2:06.66.

One of Sunday's finals will feature middle school student Runa Imai, who clocked 2:24.37 to top the women's 200 breaststroke semifinals and Kanako Watanabe, who is aiming for her fourth crown after qualifying in the event in third.