BUENOS AIRES (Reuters) - German number one Philipp Kohlschreiber pulled out when 5-4 ahead in the fifth set of a gruelling first rubber to hand Argentina the lead in their Davis Cup first round tie on Friday.
The world number 19 led 6-3 5-7 6-2 4-6 5-4 against Carlos Berlocq, a stand-in for the absent Juan Martin del Potro, when he pulled his left hamstring after a four-hour marathon played in more than 35 degrees heat.
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