The 21-year-old Dunellen native ran a 51.46 race -- 12 hundredths of a second faster than Dalila Muhammad -- in the 400-meter hurdles.
McLaughlin during the Olympic trials became the first female athlete to break 52 seconds in the 400-meter hurdles, running a 51.9 race.
Muhammad finished the race at 51.58, breaking the world record previously set by McLaughlin during trials.
McLaughlin said she's just "happy to represent her country and have this opportunity."
ALSO SEE: Five Things To Know About NJ Olympian Sydney McLaughlin
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