World Number One Victoria Azarenka of Belarus and US Open Champion Samantha Stosur have advanced into the Semifinals of Qatar Open.In Doha on Friday, Victoria Aazarenka overpowered Yanina Wickimayer of Belgium 6-0, 6-4 in straight sets. In the other quarter final Samantha Stosur had a tough time defeating Monica Niculescu in three sets, 6-2,2-6,6-3.