Brittany Bowe rebroke her 1000m world record on Saturday. Heather Richardson took it away about three minutes later.
The U.S. Olympic teammates went one-two in the season-opening World Cup on blazing-fast ice in Calgary.
Bowe, the reigning World Sprint champion, began the day holding the world record of 1:12.58 in the distance, set on Nov. 17, 2013, in Salt Lake City, an oval also known for quick times.
Bowe raced just under it in Calgary, in 1:12.54.
Richardson, the World 500m champion, followed in the next pair and knocked Bowe out of the record books in 1:12.