0 the fastest time, highest score, best result, etc. that a particular person has ever achieved in a sporting event:
I shall certainly try to come up next year and give them my personal best wishes on their marvellous record.
That was her "personal best" in the inflation athletics race.
I think that this is my personal best.
His personal best in the 3000 metres steeplechase is 8:25.69 achieved in 2000.
In the 200m, he finished sixth (of eight) in his heat, with a new personal best of 23.05, and did not advance to the final.
The result was a new personal best and the world seasons best at the time.
His personal best of 12:46.81 minutes for the 5000 metres ranks him as the fifth fastest of all time for the distance.
Her personal best for the event is 2:27:19 hours.
