personal best
noun [ C ] sports specialized uk/ˌpɜː.sən.əl ˈbest/ us/ˌpɝː.sən.əl ˈbest/ (abbreviation PB)
（运动员的）个人最好成绩
the fastest time, highest score, best result, etc. that a particular person has ever achieved in a sporting event
Hayley won the silver medal, cutting almost 11 seconds off her personal best. 海莉获得银牌，比她之前的个人最好成绩缩短了近11秒。
She finished with personal bests in six out of the seven events. 她在7个项目中的6个都取得了个人最好成绩。