Marc wants to know Savannah's older sister Callie's name. Savannah feels like she can't because Callie despises her full name and donesn't want people to know.
Play me for it!
Marc knows how competitive Savannah is so he uses that to get the inside scoop on Callie the older sister and after Marc beats her in a game of one on one. Savannah tells Marc Callie's real name and goes for Callie instead of Savannah