Result: Tobias Kamke forced to retire

Spain's Nicolas Almagro celebrates during his third round match with Jerzy Janowicz at the Australian Open tennis championship on January 18, 2013
© AP Photos
Tobias Kamke is forced to retire in his Madrid Masters clash with Nicolas Almagro on Monday.

Tobias Kamke's Madrid Masters ended in disappointment with the German forced to retire in his round-of-32 clash with Nicolas Almagro on Monday.

There were no signs of injury for Kamke in the first set against his Spanish opponent, with just one break of serve allowing Almagro to move into a one-set lead.

Kamke, who received a period of treatment at the end of the first, did begin the second, but was forced to retire after just five minutes of the second set.

It is not yet clear what type of injury troubled the German, who is currently ranked world number 82.

German Tobias Kamke wipes away sweat during his second round match at the Australian Open tennis championship on January 16, 2013
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1Scotland flag Andy Murray7,750
2Spain Rafael Nadal7,555
3Switzerland Roger Federer7,145
4Switzerland Stanislas Wawrinka5,780
5Serbia Novak Djokovic5,325
6Croatia Marin Cilic5,155
7Alexander Zverev4,470
8Austria Dominic Thiem4,030
9Japan Kei Nishikori3,285
10Canada Milos Raonic3,230
11Bulgaria Grigor Dimitrov3,070
12France Jo-Wilfried Tsonga2,770
13Belgium David Goffin2,560
14Spain Roberto Bautista Agut2,425
15Czech Republic Tomas Berdych2,390
16United States Jack Sock2,335
17Pablo Carreno Busta2,305
18Lucas Pouille2,220
19United States John Isner2,110
20United States Sam Querrey2,060