[2] Van Gemerden made one time appearances in all Grand Slams and was also briefly a Davis Cup representative member of the Netherlands team.

In 1998–1999 he comprised the Jong Oranje [5]- a prized contract presented by the KNLTB to Netherlands' most proficient junior players.

During a Mauritius Challenger tournament, late in December 2004, he was tested positive for a metabolite of cannabis or tetrahydrocannabinol (THC).

Whilst the ATP tribunal accepted Van Gemerden had committed a doping offense[6] under the rules of the Tennis Anti-Doping Program with Exceptional Circumstances; the use of cannabis, in that case, was determined to not be for performance enhancing reasons.

[9] The Dutch tennis player begin his appearance at Grand Slams starting with the 2005 Australian Open, where he was drawn up against 31st seed Juan Carlos Ferrero, who won the match in four sets.