The Dutch divas overhauled a sub-par US team in the 4x100 free relay to retain their world title - a stunning last leg from Femke Heemskirk saw her reel in Dana Vollmer (who was probably a bit tired from posting a stonking 100 fly semi time earlier on in the session) and zoom out in front. Compare the splits:
| COUGHLIN Natalie 54.09 | DEKKER Inge 54.91 |
| FRANKLIN Melissa 52.99 | KROMOWIDJOJO Ranomi 53.26 |
| HARDY Jessica 54.12 | VELDHUIS Marleen 53.33 |
| VOLLMER Dana 53.27 | HEEMSKERK Femke 52.46 |
| USA 3:34.47 | NED 3:33.96 |
