Hannah Miley looks a good bet to add to Britain's medal tally in the 200m IM and British team-mate Gemma Spofforth has been a demon in the 100m back ahead of Monday's semis.
Somebody called Michael Phelps is also in action in the 200m free.
The multi-Olympic gold medal winning superstar is likely to face Germany's Paul Biedermann in Tuesday's final, assuming both get through the semis.
Biedermann took Ian Thorpe's 400m free world record on Sunday.
What do you think of all these new records? And what are your predictions for tonight?
Men's 100m free
Women's 100m butterfly
Men's 50m butterfly
Women's 200m IM