Sarah Sjostrom clocked a world record of 51.71secs for her leg of the women's 4x100m freestyle relay final at the world championships on Sunday July 23,2017 although Sweden were only able to finish fifth.
Sarah Sjostrom became the first woman to swim under under 52 seconds as she led out the Swedish team, beating the previous record of 52.06secs set by Australia's Cate Campbell in 2016.
Sarah Sjostrom came into Budapest on the back of a season which had already seen her go close to the world records in both the 50m and 100m freestyles.
Her world record time now makes her the favourite for gold in the 100m freestyle final on Friday.
She is also the fastest into Monday's 100m butterfly final from Sunday's semis.
The Swedish sprint ace could also take gold in the 50m butterfly and the 50m freestyle later in the week.