Victoria Pendleton took more than half a second off her own British record to win her second gold medal at the track cycling World Cup event in Manchester.
Pendleton was one of three Brtish winners on Friday
Pendleton added the 500m time-trial title to the sprint she won on Friday in a time of 34.070 seconds, beating her previous best of 34.614.
Earlier Cornwall's Wendy Houvenhagel beat Yvonne McGregor's 10-year record to reach the women's pursuit final.
Both women's times would have won gold at last year's world championships.
Pendleton is concentrating totally on the sprint and the keirin since the time-trial was removed from the Olympic programme and said: "It obviously isn't doing me any harm."
Houvenhagel now meets fellow Briton Rebecca Romero, who won silver in the Olympics in rowing but has switched to cycling for next year's Beijing Olympics.
Romero's time would have been good enough for silver in last year's worlds.
Scotland's Chris Hoy - winner of Friday's kilometre - had to settle for silver in the sprint but will expect to win his second gold of the weekend in Sunday's team sprint.
Hoy, 30, will compete with Craig MacLean and Ross Edgar, the all-Scottish trio who won gold at the Commonwealth Games last spring.
The biggest threat to their chances of winning will come from an all-English trio of Jamie Staff, Matt Crampton and Jason Kenny competing under the flag of sponsors Science in Sport.
Shanaze Reade and Anna Blyth, both 18 and from Leeds, took silver behind Holland in the women's team sprint but might have won gold had Reade not completed a full lap after a false start by the Dutch.
Reade is a junior BMX world champion and a contender to win gold when the sport makes its first appearance on the Olympic programme in Beijing but is also trying her luck on the track.