Before the arrival to semifinals, Gilles Simon was the 14th French player to defeat an ATP number one, since 1973. Here we have the previous players:
Yannick Noah (Lendl 1986 and 1990)
Guy Forget (Edberg and Becker 1991)
Sebastien Grosjean (Moya 1999 and Hewitt 2003).
Henri Leconte (Lendl 1983)
Christophe Roger-Vasselin (Connors 1983)
Cedric Pioline (Courier 1993)
Jerome Golmard (Agassi 2000)
Arnaud Clément (Agassi 2000)
Arnaud Di Pasquale (Safin 2001)
Julien Boutter (Kuerten 2001)
Nicolas Escudé (Hewitt 2001)
Richard Gasquet (Federer 2005)
Singapore being realistic...
1 week ago