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Rafael Nadal upset by Juan Martin del Potro in semifinal of Shanghai Masters

  • Juan Martin del Potro of Argentina celebrates after defeating Rafael Nadal of Spain during their singles semifinal match of the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center, in Shanghai, China, Saturday, Oct. 12, 2013. Del Potro won 6-2, 6-4. (AP Photo/Eugene Hoshiko)

    Juan Martin del Potro of Argentina celebrates after defeating Rafael Nadal of Spain during their singles semifinal match of the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center, in Shanghai, China, Saturday, Oct. 12, 2013. Del Potro won 6-2, 6-4. (AP Photo/Eugene Hoshiko)  (The Associated Press)

  • El argentino Juan Martín del Potro devuelve una pelota contra el español Rafael Nadal en el Masters de Shanghai el sábado, 12 de octubre de 2013, en Shanghai. (AP Photo/Eugene Hoshiko)

    El argentino Juan Martín del Potro devuelve una pelota contra el español Rafael Nadal en el Masters de Shanghai el sábado, 12 de octubre de 2013, en Shanghai. (AP Photo/Eugene Hoshiko)  (The Associated Press)

  • Serbia's Novak Djokovic returns a shot to France's Jo-Wilfried Tsonga during the singles semifinal match of the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Saturday, Oct. 12, 2013. (AP Photo/Eugene Hoshiko)

    Serbia's Novak Djokovic returns a shot to France's Jo-Wilfried Tsonga during the singles semifinal match of the Shanghai Masters tennis tournament at Qizhong Forest Sports City Tennis Center in Shanghai, China, Saturday, Oct. 12, 2013. (AP Photo/Eugene Hoshiko)  (The Associated Press)

Top-ranked Rafael Nadal was eliminated in the semifinals of the Shanghai Masters on Saturday, losing 6-2, 6-4 to Juan Martin del Potro.

The fifth-ranked Del Potro overpowered Nadal with his deep, punishing groundstrokes, breaking the Spaniard twice at the start of the match to race out to a 4-0 lead.

The Argentine broke Nadal again to start the second set, and saved all six break points he faced to get his first victory over the Spaniard in four years.

Del Potro will try to win his first Masters title on Sunday against top-seeded Novak Djokovic, who defeated Jo-Wilfried Tsonga in the other semifinal, 6-2, 7-5.

Nadal was playing his first tournament since regaining the No. 1 ranking from Djokovic on Monday.