Dina Asher-Smith became the first British female to clock under 11 seconds in the 100m with a brilliant 10.99 seconds run to win her heat at the Anniversary Games.
The 19-year-old bettered her previous British record by 0.03 seconds.
“I’m trying to keep calm so I can execute in the final,” she told BBC Sport.
Minutes later, Shara Proctor leapt 3cm beyond her previous British record of 6.95m to win her event.
Proctor was jumping against European pentathlon champion Katarina Johnson-Thompson, who finished fourth (6.50m), and Jessica Ennis-Hill.
The Olympic heptathlon champion recorded a season’s best 6.37m to finish seventh and further boost her confidence before she decides whether to compete at next month’s World Championships.
The 26-year-old Proctor leapt further than ever before with her last effort and later said there was “more to come”.
“This crowd is what helped me the most,” said Proctor, competing in perfect conditions before a 50,000 crowd at London’s Olympic Stadium.
“They gave me that extra boost. I did not expect to jump 6.98m today. This place gave me the chills, it’s the greatest place to jump.”
Had the Briton been competing on Friday night she would have had the chills courtesy of the driving rain and wind, but for the final day of the two-day Diamond League meeting there were clear skies and almost 10,000 more spectators.
In a spectacular start to the day, Asher-Smith raised the decibels inside the stadium with a breathtaking run which helped recapture the spirit of London 2012.