<Tr> <Td> 2012 </Td> <Td> Luke Saville </Td> <Td> Taylor Townsend </Td> <Td> Liam Broady Joshua Ward - Hibbert </Td> <Td> Gabrielle Andrews Taylor Townsend </Td> </Tr> <Tr> <Td> 2013 </Td> <Td> Nick Kyrgios </Td> <Td> Ana Konjuh </Td> <Td> Jay Andrijic Bradley Mousley </Td> <Td> Ana Konjuh Carol Zhao </Td> </Tr> <Tr> <Td> 2014 </Td> <Td> Alexander Zverev </Td> <Td> Elizaveta Kulichkova </Td> <Td> Lucas Miedler Bradley Mousley </Td> <Td> Anhelina Kalinina Elizaveta Kulichkova </Td> </Tr> <Tr> <Td> 2015 </Td> <Td> Roman Safiullin </Td> <Td> Tereza Mihalíková </Td> <Td> Jake Delaney Marc Polmans </Td> <Td> Miriam Kolodziejová Markéta Vondroušová </Td> </Tr>

Who won last year's australian open tennis