Adam Gemili ran 100m in under 10 seconds but failed to make the record books because of windy conditions.
The British 21-year-old clocked 9.97 seconds at the Bedford International Games but the 3.7 metres-per-second following wind made the record invalid.
He did claim the fastest legal run of Sunday's meeting with 10.12 including the wind assistance in an earlier heat.
Gemili is now the only British sprinter to run a sub 10 second 100m and sub 20 second 200m.
Only five Britons have finished under the 10-second mark without wind assistance: Linford Christie (9.87), James Dasaolu (9.91) Chijindu Ujah (9.96), Dwain Chambers (9.97) and Jason Gardener (9.98).
And only John Regis (19.87) and Gemili have broken 20 seconds for 200m with or without wind assistance.
Gemili earned his 200m record when he won gold with a time of 19.98 at the European Championships in Zurich last year.
The Commonwealth silver medallist is now set to compete in the Birmingham Grand Prix on Sunday, 7 June.