![Austria's Julian Knowle, left, returns a ball as partner Jurgen Melzer follows play during their Davis Cup Euro-African Zone First Group, second round, tennis match against Yaraslav Shyla and Max Mirnyi of Austria's Julian Knowle, left, returns a ball as partner Jurgen Melzer follows play during their Davis Cup Euro-African Zone First Group, second round, tennis match against Yaraslav Shyla and Max Mirnyi of](https://c8.alamy.com/comp/2MW518M/austrias-julian-knowle-left-returns-a-ball-as-partner-jurgen-melzer-follows-play-during-their-davis-cup-euro-african-zone-first-group-second-round-tennis-match-against-yaraslav-shyla-and-max-mirnyi-of-belarus-in-minsk-belarus-saturday-apr-8-2017-ap-photosergei-grits-2MW518M.jpg)
Austria's Julian Knowle, left, returns a ball as partner Jurgen Melzer follows play during their Davis Cup Euro-African Zone First Group, second round, tennis match against Yaraslav Shyla and Max Mirnyi of
![Tennis - AEGON International - Devonshire Park, Eastbourne - 14/6/09 Julian Knowle of Austria in action during his third round qualifying match Mandatory Credit: Action Images / Henry Browne Livepic Stock Photo - Alamy Tennis - AEGON International - Devonshire Park, Eastbourne - 14/6/09 Julian Knowle of Austria in action during his third round qualifying match Mandatory Credit: Action Images / Henry Browne Livepic Stock Photo - Alamy](https://c8.alamy.com/comp/2EHNPF0/tennis-aegon-international-devonshire-park-eastbourne-14609-julian-knowle-of-austria-in-action-during-his-third-round-qualifying-match-mandatory-credit-action-images-henry-browne-livepic-2EHNPF0.jpg)
Tennis - AEGON International - Devonshire Park, Eastbourne - 14/6/09 Julian Knowle of Austria in action during his third round qualifying match Mandatory Credit: Action Images / Henry Browne Livepic Stock Photo - Alamy
![Austrian tennis players Knowle, Melzer and team captain Muster take a break during practice at the Sydney International Tennis Centre in Sydney. Austrian tennis players (L-R) Julian Knowle, Jurgen Melzer and team Austrian tennis players Knowle, Melzer and team captain Muster take a break during practice at the Sydney International Tennis Centre in Sydney. Austrian tennis players (L-R) Julian Knowle, Jurgen Melzer and team](https://l450v.alamy.com/450v/2d4cm06/austrian-tennis-players-knowle-melzer-and-team-captain-muster-take-a-break-during-practice-at-the-sydney-international-tennis-centre-in-sydney-austrian-tennis-players-l-r-julian-knowle-jurgen-melzer-and-team-captain-thomas-muster-take-a-break-during-practice-at-the-sydney-international-tennis-centre-in-sydney-march-3-2005-australia-will-meet-austria-in-the-first-round-of-the-davis-cup-on-march-4-reuterswill-burgess-2d4cm06.jpg)
Austrian tennis players Knowle, Melzer and team captain Muster take a break during practice at the Sydney International Tennis Centre in Sydney. Austrian tennis players (L-R) Julian Knowle, Jurgen Melzer and team
![The pair of Mark Knowles of Bahamas , bottom, and Daniel Nestor of Canada, top, play during their doubles final match against the pair of Simon Aspelin of Sweden and Julian Knowle The pair of Mark Knowles of Bahamas , bottom, and Daniel Nestor of Canada, top, play during their doubles final match against the pair of Simon Aspelin of Sweden and Julian Knowle](https://c8.alamy.com/comp/2PATKKR/the-pair-of-mark-knowles-of-bahamas-bottom-and-daniel-nestor-of-canada-top-play-during-their-doubles-final-match-against-the-pair-of-simon-aspelin-of-sweden-and-julian-knowle-of-austria-at-the-tennis-masters-cup-shanghai-sunday-nov-18-2007-in-shanghai-china-knowlesnestor-pair-beat-aspelinknowle-pair-6-2-6-3-ap-photoeugene-hoshiko-2PATKKR.jpg)