Career
2001 NK Mixed foursome
2007-2008 MK Champion Pairs
2010 NK Mixed foursome
Runner up in the Champion MK foursome in 1987, 1997, 1998, 1999, 2009 and 2011. Bertens has played on Netherlands teams in world championship tournaments 2000, 2005, 2007, 2008, and 2009. In odd years (Bermuda Bowl) that implies a top-six rank in the preceding European Bridge League open teams championship.
2005: 1st place, European Open in Tenerife
2006: 1st place (pairs), Cavendish Invitational in Las Vegas with Ton Bakkeren
2006: 1st place, Patton Pinkster Tournament at it Onstein with Ton Bakkeren, Vincent Ramondt and Berry Westra
2007: 1st place, Nippon Electric Corporation Cup in Yokohama
2007: 1st place, White House Tournament in Amsterdam
2007: Bronze medal (Netherlands), World national teams (Bermuda Bowl)
2008: 5th place (Netherlands), national teams at the first World Mind Sports Games
2009: 1st place, Yeh Bros Cup in Australia with Ton Bakkeren, Sjoert Brink and Bas Drijver
2009: 5th place (Netherlands), World Teams Championships (Bermuda Bowl)
2011: Quarter final ("t Onstein) World Transnational Teams Championships.
