The draw for the Porsche Tennis Grand Prix in Stuttgart, Germany has been released and Maria has been drawn to play world No.35 Roberta Vinci of Italy in the first round.
Maria has played the 34-year-old twice before and leads the series 2-0, here are the matches they have played against each other:
2007 US Open R1: Maria won 6-0 6-1
2012 Indian Wells R4: Maria won 6-2 6-1
This match will be played on Wednesday.
The first seed Maria can meet is No.7 seed Agnieszka Radwanska of Poland in the second round.
Maria is making her fifth appearance on the indoor clay courts in Stuttgart and her best result was winning the title in 2012, 2013 & 2014.