With half of the Final Four decided, 13 contestants are still mathematically alive to win the 14th annual Living Room Times men's NCAA pool -- but that number will decrease to somewhere between three and five after Sunday's games.

To stay alive, current leader Michael Walsh needs Oklahoma to beat North Carolina in the late game. So does Shaun Sullivan, presently in second place. Marty West, tied for third with already-eliminated Dan Dinunzio, needs North Carolina to win.

The other 10 still-alive contestants each need both of Sunday's games to go a certain way, or they'll be eliminated. Specifically:

• Ian Marenna, Geoff Brookes, Jennifer Elam and Kevin Curran need Louisville and UNC to win.
• Nick Surmacz needs Louisville and OU to win.
• Mike Wiser, Neil Waechter, Lauren Barkmeier and Jason Strutz need Michigan State and UNC to win.
• Sören Hammerschmidt needs Michigan State and OU to win.

Here is what the endgame scenarios would look like heading into the tournament's final weekend, after each of tomorrow's four possible combinations of outcomes:

If Louisville and UNC win:
• Ian Marenna wins if UConn wins title
• Marty West wins if Villanova wins title or loses title game to Louisville
• Geoff Brookes wins if Louisville beats UNC in title game
• Jennifer Elam wins if UNC beats Louisville in title game
• Kevin Curran wins if UNC beats UConn in title game

If Louisville and Oklahoma win:
• Shaun Sullivan wins if UConn wins title
• Michael Walsh wins if Oklahoma wins title or if Villanova beats UConn in title game
• Marty West wins if it's a Louisville-Villanova title game
• Nick Surmacz wins if Louisville beats Oklahoma in title game

If Michigan State and UNC win:
• Mike Wiser wins if Michigan State wins title
• Neil Waechter wins if UConn wins title
• Lauren Barkmeier wins if UConn reaches title game but loses
• Jason Strutz wins if UNC beats Michigan State in title game
• Marty West wins if Villanova beats Michigan State in title game

If Michigan State and Oklahoma win:
• Sören Hammerschmidt wins if Michigan State beats UConn in Final Four
• Michael Walsh wins if UConn beats MSU but then loses in title game
• Shaun Sullivan wins if UConn wins national title