![Mariano Zabaleta, of Argentina, returns a shot against Ivo Karlovic, of Croatia, during their U.S. Men's Clay Court Championships finals tennis match Sunday, April 15, 2007, in Houston. Karlovic defeated Zabaleta 6-4, Mariano Zabaleta, of Argentina, returns a shot against Ivo Karlovic, of Croatia, during their U.S. Men's Clay Court Championships finals tennis match Sunday, April 15, 2007, in Houston. Karlovic defeated Zabaleta 6-4,](https://c8.alamy.com/comp/2PBMBK4/mariano-zabaleta-of-argentina-returns-a-shot-against-ivo-karlovic-of-croatia-during-their-us-mens-clay-court-championships-finals-tennis-match-sunday-april-15-2007-in-houston-karlovic-defeated-zabaleta-6-4-6-1-to-win-the-tournament-ap-photodavid-j-phillip-2PBMBK4.jpg)
Mariano Zabaleta, of Argentina, returns a shot against Ivo Karlovic, of Croatia, during their U.S. Men's Clay Court Championships finals tennis match Sunday, April 15, 2007, in Houston. Karlovic defeated Zabaleta 6-4,
![Yen Hsun Chinese Taipei Returns Shot Ivo Karlovic Croatia Second – Stock Editorial Photo © ChinaImages #241958202 Yen Hsun Chinese Taipei Returns Shot Ivo Karlovic Croatia Second – Stock Editorial Photo © ChinaImages #241958202](https://st4.depositphotos.com/21607914/24195/i/1600/depositphotos_241958202-stock-photo-yen-hsun-chinese-taipei-returns.jpg)
Yen Hsun Chinese Taipei Returns Shot Ivo Karlovic Croatia Second – Stock Editorial Photo © ChinaImages #241958202
![Tommy Haas, from Germany, hits a backhand against Ivo Karlovic, from Croatia, during their first round match of Mercedes-Benz Cup , Tuesday, July 26, 2005, in Los Angeles. (AP Photo/Kevork Djansezian Stock Tommy Haas, from Germany, hits a backhand against Ivo Karlovic, from Croatia, during their first round match of Mercedes-Benz Cup , Tuesday, July 26, 2005, in Los Angeles. (AP Photo/Kevork Djansezian Stock](https://c8.alamy.com/comp/2PE0HBW/tommy-haas-from-germany-hits-a-backhand-against-ivo-karlovic-from-croatia-during-their-first-round-match-of-mercedes-benz-cup-tuesday-july-26-2005-in-los-angeles-ap-photokevork-djansezian-2PE0HBW.jpg)
Tommy Haas, from Germany, hits a backhand against Ivo Karlovic, from Croatia, during their first round match of Mercedes-Benz Cup , Tuesday, July 26, 2005, in Los Angeles. (AP Photo/Kevork Djansezian Stock
![Rainer Schuettler of Germany returns the ball to Ivo Karlovic of Croatia during their first round match at ATP Zagreb Indoors Tennis Tournament in Zagreb, Croatia, Wednesday, Feb. 1, 2006. (AP Photo/Filip Rainer Schuettler of Germany returns the ball to Ivo Karlovic of Croatia during their first round match at ATP Zagreb Indoors Tennis Tournament in Zagreb, Croatia, Wednesday, Feb. 1, 2006. (AP Photo/Filip](https://c8.alamy.com/comp/2PDDDMT/rainer-schuettler-of-germany-returns-the-ball-to-ivo-karlovic-of-croatia-during-their-first-round-match-at-atp-zagreb-indoors-tennis-tournament-in-zagreb-croatia-wednesday-feb-1-2006-ap-photofilip-horvat-2PDDDMT.jpg)
Rainer Schuettler of Germany returns the ball to Ivo Karlovic of Croatia during their first round match at ATP Zagreb Indoors Tennis Tournament in Zagreb, Croatia, Wednesday, Feb. 1, 2006. (AP Photo/Filip
![Ivo Karlovic and Ernests Gulbis are in action at the Erste Bank Open in Vienna | Tennis News | Sky Sports Ivo Karlovic and Ernests Gulbis are in action at the Erste Bank Open in Vienna | Tennis News | Sky Sports](https://e0.365dm.com/15/09/768x432/murray-peers-us-open-doubles_3349834.jpg?20150912133053)
Ivo Karlovic and Ernests Gulbis are in action at the Erste Bank Open in Vienna | Tennis News | Sky Sports
![Ivo Karlovic and Ernests Gulbis are in action at the Erste Bank Open in Vienna | Tennis News | Sky Sports Ivo Karlovic and Ernests Gulbis are in action at the Erste Bank Open in Vienna | Tennis News | Sky Sports](https://e0.365dm.com/15/10/2048x1152/tennis-ivo-karlovic-shanghai_3365820.jpg)
Ivo Karlovic and Ernests Gulbis are in action at the Erste Bank Open in Vienna | Tennis News | Sky Sports
![Ivo Karlovic Croatia Returns Shot Vasek Pospisil Canada First Match – Stock Editorial Photo © ChinaImages #237317710 Ivo Karlovic Croatia Returns Shot Vasek Pospisil Canada First Match – Stock Editorial Photo © ChinaImages #237317710](https://st4.depositphotos.com/21607914/23731/i/1600/depositphotos_237317710-stock-photo-ivo-karlovic-croatia-returns-shot.jpg)
Ivo Karlovic Croatia Returns Shot Vasek Pospisil Canada First Match – Stock Editorial Photo © ChinaImages #237317710
![Croatia's Ivo Karlovic reacts after winning the fourth set against Italy's Andreas Seppi during their third round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 19, 2018. (AP Croatia's Ivo Karlovic reacts after winning the fourth set against Italy's Andreas Seppi during their third round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 19, 2018. (AP](https://l450v.alamy.com/450v/2ne6dkn/croatias-ivo-karlovic-reacts-after-defeating-ecuadors-nicolas-lapentti-in-their-davis-cup-tennis-match-in-varazdin-croatia-friday-march-5-2010-ap-photodarko-bandic-2ne6dkn.jpg)
Croatia's Ivo Karlovic reacts after winning the fourth set against Italy's Andreas Seppi during their third round match at the Australian Open tennis championships in Melbourne, Australia, Friday, Jan. 19, 2018. (AP
![Ivo Karlovic hits 17 aces in two-set win over Andreas Seppi to add to his serving record | Daily Mail Online Ivo Karlovic hits 17 aces in two-set win over Andreas Seppi to add to his serving record | Daily Mail Online](https://i.dailymail.co.uk/i/pix/2015/10/19/22/2D90001000000578-0-image-a-1_1445288976535.jpg)
Ivo Karlovic hits 17 aces in two-set win over Andreas Seppi to add to his serving record | Daily Mail Online
![Tennis' elder statesman Karlovic not satisfied with just an ATP wins - Latest Sports News In Nigeria Tennis' elder statesman Karlovic not satisfied with just an ATP wins - Latest Sports News In Nigeria](https://www.brila.net/wp-content/uploads/2019/03/karlovic-melbourne-2018-wednesday3.jpg)