The following year, during the 2017 World Championships in London, Felix added three more medals to her collection, cementing her position as the most decorated athlete in IAAF World Championships history. Felix equaled Merlene Ottey's and Usain Bolt's 14 medal tally by winning a bronze medal in the 400-meter final with a time of 50.08 seconds. She admitted that the result was disappointing, as she was hoping to defend her title in the discipline. Just a month prior to the championships, Felix had won the London's Diamond League meet held at the same track with a world-leading time of 49.65 seconds. Felix earned two additional gold medals by partaking in the 4 × 100 and 4 × 400 meters relay events, bringing her tally up to 16 world championship medals.