Five national records highlighted the second day of the Japanese championships.
In the women's 100 backstroke prelims, Mai Nakamura (98 World Championships silver medallist) bettered the record of 1:01.06 by Noriko Inada from 1999 with 1:00.89. In semi-final, Nakamura won the event with 1:00.93 . Inada was second with 1:01.46.
The second and third national record came from Masami Tanaka (Short course 200 Breaststroke World Record Holder) . Tanaka clocked 1:07.88 in the women's 100 breaststroke prelims and bettered it with 1:07.38 in the semi-final. It was the fastest record for the season.
The 17 year-old Kosuke Kitajima beat Akira Hayashi and Ryosuke Imai with a new national record time of 1:01.41. Hayashi also bettered his eight - year old mark of 1:01.76 with 1:01.51.
Junko Onishi got her first national title with the time of 59.01 in women's 100 butterfly. It was the second fastest in the Japanese Record chronology.
It was an surprising race in the men's 400 I.M. with Susumu Tabuchi first with 4:16.04 and Shinya Tabuchi second with 4:19.65. Both bettered the old mark of 4:20.07 by Takahiro Fujimoto from the 92 Barcelona Olympics.