Lukas Horvat leads by a whisker over Grant and Lindqvist, while former king Okafor sinks to a humiliating eighth.
Maya Chen bagels Oliver Grant in the second set, then collapses 10-0 in the tiebreak. Oliver now trails Lukas Horvat by one point.
Sofia Rossi beat her old coach Marco Bianchi 7-5, 6-4, extending her head-to-head lead to 3-0.
Clara Dubois beats Elena Petrova 6-4, 6-4, leads their H2H 2-1 and closes to one point behind Jakob Horvat.
Daniel Okafor beats Hannah Weber 6-3, 7-5 for a 4-0 head-to-head as Oliver Grant looms.
Lukas Horvat thrashes Sam Whitaker 6-2, 6-3, keeps first place, and leaves Sam winless at the bottom.
Emma Lindqvist crushes Jakob Horvat 6-2, 6-4 and closes in on the top as brother Lukas leads the league.
Tom Fletcher beats Ben Carter 6-4, 6-3, leads their head-to-head 2-1 and now chases Elena Petrova.
Ben Carter crushes Sam Whitaker 6-2, 6-0 to go 3-0 head-to-head, while Sam stays winless at the bottom.