At the moment, Sevastova is ranked 13th in the WTA rankings, while Siegemund is ranked 99th.
Sevastova has earned 100 WTA ranking points for advancing to the quarterfinals of the Stuttgart tournament, where she will play world number three Petra Kvitova of the Czech Republic.
As reported, Sevastova defeated Latvia's Alona Ostapenko 6-2, 4-6, 6-0 in the first round of the Women's Stuttgart Open on April 23.
