<Table> <Tr> <Th_colspan="2"> 2015 NCAA Tournament Championship Game </Th> </Tr> <Tr> <Td_colspan="2"> National Championship Game </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th> Wisconsin Badgers </Th> <Th> Duke Blue Devils </Th> </Tr> <Tr> <Td> (36--3) </Td> <Td> (34--4) </Td> </Tr> <Tr> <Td> 63 </Td> <Td> 68 </Td> </Tr> <Tr> <Td> Head coach: Bo Ryan </Td> <Td> Head coach: Mike Krzyzewski </Td> </Tr> <Tr> <Td> <Ul> <Li> AP: 3 </Li> <Li> Coaches: 3 </Li> </Ul> </Td> <Td> <Ul> <Li> AP: 4 </Li> <Li> Coaches: 5 </Li> </Ul> </Td> </Tr> </Table> </Td> </Tr> <Tr> <Td_colspan="2"> <Table> <Tr> <Th> </Th> <Th> </Th> <Th> </Th> <Th> Total </Th> </Tr> <Tr> <Td> Wisconsin </Td> <Td> 31 </Td> <Td> 32 </Td> <Td> 63 </Td> </Tr> <Tr> <Td> Duke </Td> <Td> 31 </Td> <Td> 37 </Td> <Td> 68 </Td> </Tr> </Table> </Td> </Tr> <Tr> <Th> Date </Th> <Td> April 6, 2015 </Td> </Tr> <Tr> <Th> Arena </Th> <Td> Lucas Oil Stadium </Td> </Tr> <Tr> <Th> Location </Th> <Td> Indianapolis, Indiana </Td> </Tr> <Tr> <Th> MVP </Th> <Td> Tyus Jones, Duke </Td> </Tr> <Tr> <Th> Favorite </Th> <Td> Wisconsin by 1 </Td> </Tr> <Tr> <Th> Referee (s) </Th> <Td> Joe DeRosa, Michael Stephens, and Pat Driscoll </Td> </Tr> <Tr> <Th> Attendance </Th> <Td> 71,149 </Td> </Tr> <Tr> <Th_colspan="2"> United States TV coverage </Th> </Tr> <Tr> <Th> Network </Th> <Td> CBS </Td> </Tr> <Tr> <Th> Announcers </Th> <Td> Jim Nantz (play - by - play) Bill Raftery and Grant Hill (color) Tracy Wolfson (sideline) </Td> </Tr> <Tr> <Th> Nielsen Ratings </Th> <Td> 17.1 (28.3 million) </Td> </Tr> </Table> <Tr> <Th_colspan="2"> 2015 NCAA Tournament Championship Game </Th> </Tr>

Which team won the ncaa mens basketball championship in april 2015