Career
Grol competed in the 2007 European Judo Championships in Belgrade, Serbia in the men"s under 90 kg, as a replacement for Mark Huizinga, who cancelled last minute due to personal problems. After a highly competitive race against Elco van der Geest, Grol ended up to be the 2008 representative for the men"s 100 kg category for the Netherlands at the 2008 Olympics in Beijing. There he reached the semifinals, where he was beaten by Askhat Zhitkeyev from Kazakhstan.
He competed at the 2012 Summer Olympics, reaching the quarter-finals, where he lost to Dimitri Peters of Germany.