Nadal advances to semifinal in Shanghai

JUSTIN BERGMAN (Associated Press)
The Associated Press
Djokovic, Nadal edge challengers in Shanghai
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Juan Martin del Potro of Argentina returns a shot to Nicolas Almagro of Spain during the singles quarterfinal match of the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center, in Shanghai, China, Friday, Oct. 11, 2013. Del Potro won 6-3, 6-3. (AP Photo/Eugene Hoshiko)

SHANGHAI (AP) -- Rafael Nadal and Novak Djokovic overcame tough challenges in their quarterfinals at the Shanghai Masters on Friday and moved a step closer to a possible showdown in the final.

Top-ranked Nadal saved three set points and finally closed out a 20-minute tiebreak in the first set against Switzerland's Stanislas Wawrinka before winning 7-6 (10), 6-1.

Djokovic, the defending champion, needed nearly 2 1/2 hours to rally past France's Gael Monfils 6-7 (4), 6-2, 6-4.

Djokovic and Nadal improved to a combined 20-0 record against the pair.