World number one Novak Djokovic retired from the Dubai Tennis Championships due to eye problem.
The Serb withdrew on Thursday after losing the first set of a quarter-final match against Spain's Feliciano Lopez, Xinhua news agency reported.
The last time the Serb retired during a match was against Argentina's Juan Martin del Potro in the 2011 Davis Cup.
World number four Stan Wawrinka of Switzerland won Thursday his quarterfinal match against Germany's Kohlschreiber, 7-5, 6-1.
Kohlschreiber, ranked 34, never really challenged Wawrinka as the Swiss scored seven aces during the encounter.
In other matches, Marcos Baghdatis won 7-5, 6-0 against Roberto Bautista Agut from Spain, while Australia's Nick Kyrgios defeated Tomas Berdych from Czech Republic 6-4, 6-4.
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