Ireland's Cian O'Connor set a blistering pace to run away with the BIC Select Speed Stakes at Olympia.
And he put himself firmly in the frame for leading rider of the show honours ahead of tonight's finale - the Olympia Grand Prix.
O'Connor destroyed a high-class field of 21 riders - despite an early draw of third - on board the Castle Martin Stud-owned horse Complete.
He clocked 47.78 seconds for the round against the clock competition, finishing almost two seconds ahead of second-placed Michael Whitaker, with Belgium's Philippe Le Jeune third.
It was enough to take Le Jeune top of the leading rider standings, although William Whitaker came closest - time-wise - to pipping O'Connor.
Whitaker finished just three hundredths of a second behind O'Connor, but eight seconds were added to his time after his mount Carnaval Path knocked down the last two fences.
O'Connor said: ‘It's nice to have a victory. Complete was second in the Geneva Grand Prix last week - he has a big stride, which helps in an event like this one.’
Ellen Whitaker, meanwhile, hit the heights again on Ladina B after finishing joint-first with her cousin William in Friday's puissance.
The combination cleared 6ft 5in to take a share of the spoils with Frenchman Philippe Rozier in the day's opening BIC Select Six Bar class.
Rozier, aboard Ideal de Prissey, and Whitaker emerged from a field of nine to contest the final round - and ultimately share top prize.
Whitaker said: ‘She is a very strong horse.
‘When I first tried her, she pulled me about all over the place. She is a really good horse - maybe a good Hickstead Derby horse for me.’
Three riders tied for third - Irishman Denis Lynch, Germany's Alois Pollmann-Schweckhorst and Britain's Robert Whitaker - while Laura Renwick, on Twister X, proved the solitary first-round casualty.