►SUBSCRIBE: http://bit.ly/SkySportsSub Michael van Gerwen hit a stunning bull-outer bull-bull finish as he beat John Henderson 5-1 at the Grand Slam of Darts. MORE FROM SKY SPORTS ON YOUTUBE: ►SKY SPORTS FOOTBALL: http://bit.ly/SSFootballSub ►SKY SPORTS BOXING: http://bit.ly/SSBoxingSub ►SKY SPORTS CRICKET:…