Mallory Comerford opened her world championships in record fashion. In the 200 free prelims, she went 1:52.52 to break Missy Franklin‘s 1:52.74 from the Duel In the Pool in 2015.

The short course world record is 1:50.43 by Sarah Sjostrom.

Comerford’s prelims swim sets up an interesting showdown in the final as Australia’s Ariarne Titmus was seconding 1:52.66.

Russia’s Veronika Andrusenko took the third seed in 1:54.11, followed by Femke Heemskerk of the Netherlands, who finished in 1:54.16.

Also making the finals are Sweden’s Michelle Coleman (1:54.22), Italy’s Federica Pellegrini (1:54.46), China’s Wang Jianjiahe (1:54.63) and Czech Republic’s Barbora Seemanova (1:54.82).

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