 Complete the following phrase:  On the first day of the World Championships, Manuel anchored the womens 4x100-meter freestyle relay to a gold medal alongside Mallory Comerford, Kelsi Worrell, and Ledecky. She split a very fast 52.14 to anchor the team to a new American record time of 3:31.72. Manuel picked up her second gold of the meet when she anchored the mixed 4x100-meter medley relay with a split of 52.17. Together with Matt Grevers, Lilly King, and Caeleb Dressel, the team broke the world record in a time of 3:38.56. Manuels first individual event of the meet was the 100-meter freestyle, where Swedish swimmer Sarah Sjöström was widely considered the favorite to win since she had broken the world record while leading off the 4x100-meter freestyle relay on the first night of the World Championships. In similar fashion to the previous summer at the Olympics, Manuel upset the favorite by coming from behind to win the 