Sander Groen (born 16 June 1968) is a professional tennis player from the Netherlands.
Groen enjoyed most of his tennis success while playing doubles. During his career he won 1 doubles title. He achieved a career-high doubles ranking of World No. 61 in 1997 and a career-high singles ranking of World No. 177 in 1996.
Groen is known for being the doubles partner of many top-5 singles players like Pat Cash, Goran Ivanisevic, Gustavo Kuerten, Marcelo Rios, Magnus Norman, Greg Rusedski, Alex Corretja, Marc Rosset and Roger Federer. Roger Federer actually won his first ever title on the tour playing together with Sander Groen in Segovia 1999, the finals was played on Roger Federer's 18th birthday.
In 2004 Sander Groen made his mark on the ITF senior tour by winning the men's singles over 35 world championships followed by finishing runner-up in 2005 and 2006. He also won the men's singles over 35 European championships in 2005.
Groen is still active on the professional tour - as of April 29, 2013 he is ranked World No. 590 in doubles by the ATP.