Cowboys guard Zack Martin leaves preseason game against Bengals with knee injury Unknown 01:21 The Cowboys lost Zack Martin to a knee injury during their second preseason game. Share this Share on FacebookTweet on TwitterPlus on Google+ Related PostsCalculating Russia 2018’s toughest groupsMcDonald’s FIFA World Cup Fantasy is live!Watch the Russia 2018 Official Song music videoFIFA signs LUCI as Asian Regional Supporter for 2018 FIFA World Cup Russia™Football official Kwesi Nyantakyi banned from all football activities for 90 days by independent Ethics CommitteeItaly and Spain qualify for France 2019