Lauren Chambers set the U.S. Junior Record in the hammer to lead the USC track and field team in the first full day of action at the 52nd Annual Mt. SAC Relays being held at Hilmer Lodge Stadium in Walnut, Calif.

The freshman Chambers established a new U.S. Junior hammer throw record in winning the women's University/Open hammer throw competition with a mark of 206-5 (62.93m). Chambers actually broke the record twice as her first throw was 203-7 (62.05), but before her implement was returned by the officials who had wisked it off to verify that it was legal, she broke the mark again with her back-up implement in her third throw. That implement was also cleared, but Chambers had fouls in her final three efforts on the day. Her mark also moves her from sixth to fourth on USC's all-time list in the hammer.