Korean sprinter Joel Jin Nwamadi has been setting new personal-best times in the men's 100 meters at virtually every meet this season. The 20-year-old said he will try to break it one more time next month at the Asian Games in Japan. Born in Seoul to a Nigerian father and a Korean mother, Nwamadi posted a personal-best 10.23 seconds at an event in Japan in April. Earlier at the same competition, he clocked a wind-aided 10.08 seconds, just 0.01 second shy of a nine-year-old national record, with a tail wind of 3.5 meters per second (m/s). In athletics, if a tail wind exceeds 2.0 m/s, the result is not recognized as official. Later in April, Nwamadi broke his personal record with 10.19 seconds. In May, Nwamadi posted a time of 10.09 seconds with a tail wind of 2.8 m/s at the Asian Games national team trials. Two months later, he ran 10.13 seconds at a Japan meet in more pristine conditions. The sprinter then reached even greater heights this month, touching 10.07 seconds with a 3.2 m/s tail wind in Japan to unofficially tie the national record. Nwamadi's surge has prompted the record holder,