It's unbelievable man, unheard of until now, everything is impossible until someone does it."

Nathan Adrian, after US teammate Caeleb Dressel won three world gold medals in just 98 minutes on Saturday

"That will light some fire under me for the next couple of years."

Katie Ledecky, after taking silver in the women's 200m freestyle final - her only defeat in 15 world finals spanning three championships

"I'm really happy I could erase one of those textile-suit records. A lot of people thought those times from 2009 would be impossible to beat."

Sarah Sjostrom, after the Swede's 50m freestyle world record bettered Brita Stefan's mark set in 2009

"I had a bit of snot on my face, it was really annoying I could feel it everywhere, it gave me something else to think about other than hurting."

Emily Seebohm had more than just her rivals to worry about in the women's 50m backstroke heats

"I don't think I'll ever retire. I think I'll just fizzle out, that will probably be my game plan, or stop being relevant, that's probably when I'll stop showing up at these meets. I just love the lifestyle."

Matt Grevers, the evergreen American, 32, who won silver in the men's 100m backstroke and bronze over 50m

"People know me for laughing, but if they see me crying they will be very sad, so this time I will go home before I cry."

Fu Yuanhui, on her heartbreak at missing out on gold by just 0.01sec in the women's 50m backstroke final

"What is today's date? I have a maths test in two days, I'm not good at maths, it's tough being at college and doing all this, so thank you to my algebra teacher."

Caeleb Dressel, after becoming the first swimmer to win three gold medals in one day at the world championships