The 27-year-old Pole reached the top of a 15-metre wall in 6.84 seconds to win the first leg of the three-event Olympic final.
The previous world record of 6.96 seconds was set last year by Russian climber Iuliia Kaplina, who did not make the Olympic final in Tokyo.
Aleksandra Mirosław. Photo: PAP/Leszek Szymański
In addition to a head-to-head race up the wall, the Olympic climbing competition consists of bouldering, which requires climbers to scale obstacles set along a low wall, and a timed climb that tests endurance.
The combined score determines the overall winner.
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Source: TVP Sport, PAP, Reuters