Andika mwendelezo kwa aya hii - Katika FIL Luge Ulaya Mashindano, Gruber alishinda medali tisa na dhahabu mbili (Wanaume doubles: 2008, 2014), fedha nne (Wanaume doubles: 2004; Mchanganyiko wa timu: 2004, 2006
, 2013), na shaba tatu (waume doubles: 2006; Mchanganyiko wa timu: 2012, 2014).