Rebecca Adlington is through to the women's 400m freestyle final, but only as the eighth-fastest qualifier.
The Olympics champion from Mansfield came first in her heat in 4:05.75" beating America's Chloe Sutton.
North Yorkshire's Jo Jackson failed to qualify though, finishing 7th in the same heat.
Double Olympic swimming champion Rebecca Adlington, from Mansfield, has become the target of internet trolls - people who post offensive and anonymous insults online.
She has now vowed to avoid the internet during the Olympic Games after being taunted over her looks and personality.
Rebecca Adlington says there's still a lot of work to do