One of the most talked about records set during last year's GWR Day was Japan's Kenichi Ito's new benchmark for the Fastest 100 m running on all fours - a record he has set on five occasions.
Kenichi was attempting to better his record once again for today's GWR Day celebrations, but he's seen his record smashed after being beaten into second place by a teenage challenger.
Nineteen-year-old Katsumi Tamakoshi finished in a time of 15.86 seconds during the showdown at Komazawa Olympic Park Athletic Field, in Setagaya, Tokyo, shaving a full second off Kenichi's previous finishing time.
Check out the race here:
For a full round-up of the day's action from GWR Day 2014, click here.