Lynsey Sharp set a new Scottish indoor 800m record with victory at the David Hemery Valentine Invitational.
The 25-year-old won in 2:00.30 in Boston and, subject to ratification, will now be Scotland's national indoor and outdoor record holder.
The Commonwealth Games silver medallist finished ahead of Americans Anima Banks and Annette Melcher to beat Laura Muir's previous record of 2:00.94.
Sharp moves up to fifth on the British indoor all-time list.
Jenny Meadows holds the best time of 1:58.43, set in the World Championships in Doha in 2010.
Sharp's best outdoor time of 1:57.71 came in Berlin last year.