With fellow crew member Annemieke Bes and Mandy Mulder as helmsman,[2][3] Witteveen took Silver medal in the Yngling.

At the Open Week World Championships in Spain she finished 9th and her next goal was to qualify for the 2004 Summer Olympics, but these came to early for Witteveen.

Despite the successes in rowing and in the Laser Radial Witteveen decided to sail with Lisa Westerhof in the 470 and aim for qualification for the 2008 Summer Olympics in Beijing.

In 2007 a team was formed of nine sailors, (among them were Mandy Mulder, Annemieke Bes, Merel Witteveen, Renée Groeneveld, Marije Faber, Marije Kampen and Brechtje van der Werf), that aimed and qualify for the Olympics in the Yngling.

Witteveen was a Fellow by McKinsey & Company (2012 – 2014)[5] and is currently an MBA student at Stanford Graduate School of Business.