Shanghai - Gilles Simon put himself into position for a possible spot in the semi-finals of the Masters Cup with a Friday victory, but will have to await the fate of Roger Federer.
The French debutant pounded alternate Radek Stepanek 6-1, 6-4 in 65 minutes, breaking three times and never in danger against the Czech who filled in at the last minute at mid-week for injured Andy Roddick.
But the drama level was rising as four-time year-end champion Federer played a do-or-die final Red group match later against Andy Murray, Britain's world number four who has already qualified into the weekend final four.