 The Grand Slam was originally simply called the Grand Slam of Curling until 2008 when the rights were sold by the CBC to Capital One bank which renamed the Grand Slam the Capital One Grand Slam of Curling.Unlike the other World Curling Tour events, these Grand Slams they are played in 8-end games as opposed to the usual 10 end games found in the other WCT events.Another new rule that was first put into practice at the men’s nationals in 2014 is the 5 rock rule which increased the 4 rock rule and free guard zone rule by another rock.