Maria will play her first match at the Porsche Tennis Grand Prix in Stuttgart, Germany on Wednesday against world No.35 Roberta Vinci of Italy.
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
The match will be played on Centre Court, not before 6.30 PM local time (12.30 PM ET & 9.30 AM PT).