The 2015 edition of Jumping Indoor Maastricht kicks off on Friday, and as usual the event welcomes some very good riders. On the list is double World and European Champion Jeroen Dubbeldam, who will be joined by his gold medal winning team mate from Aachen Jur Vrieling - in addition to several other top Dutch riders. Other famous names include John Whitaker, Jos Lansink, Lauren Hough, Steve Guerdat and Marco Kutscher.