Whakakiia te rerenga e whai ake nei: I muri i te wikitoria i te mētara hiriwa i te 50 m ki te uma, me te mētara parahi i te 100 m ki te uma i te European Junior Swimming Championships 2004 i Lisbon, Portugal. I timata a Stekelenburg i tana whakataetae matua a-ao i te 2005 World Aquatics Championships i Montreal, Quebec, Canada i reira i whakakorea ai ia i te 50 m me te 100 m breaststroke. I ngā tau e whai ake nei, ka eke ia ki ngā whakataetae Pākehā maha, ā, ko tana mahi tino pai i te whakataetae
2008 European Aquatics Championships i Eindhoven i tana whenua i te whenua o Netherlands, ka mutu i te 6th i te 50 m breaststroke whakamutunga i muri i te kaukau i te rekoata a motu i te haurua whakamutunga.