Johan Janse van Vuuren scored a treble at Turffontein Inside on Thursday, two of them ridden by Keagan de Melo.
Corne Spies and Marco van Rensburg scored a double together.
Janse van Vuuren goes to 25 wins for the season at a 17.99% strike rate.
De Melo is on 94 wins at 22.76% and is 33 clear of second-placed Muzi Yeni.
Corne Spies is on 13 wins for the season at 9.42%.
Marco van Rensburg is on 17 wins at 10.24%.
