Upsets at the French Open continue. After the exits of top three seeds in Women's Singles and world number three Stanislas Wawrinka, it was world number four Roger Federer who made a shock exit yesterday.In the pre-quarterfinals last evening, Latvian Ernests Gulbis beat Federer, 6-7, 7-6, 6-2, 4-6, 6-3 to hand him his worst French Open defeat in a decade.Frenchman Jo-wilfried Tsonga also bowed out yesterday.