Heemskerk won her first individual world title at the 2014 world short course championships in Doha, Qatar, in the 100 m freestyle, ahead of Sarah Sjöström and Kromowidjojo. She won three more gold medals in the freestyle relays. In the 4 × 100 m freestyle relay, she swam a split time of 50.58 s, the only split under 51 seconds in the field.