SHANGHAI - Argentine sixth seed Juan Martin del Potro set up a final showdown against defending champion Novak Djokovic at the Shanghai Masters after pulling off a 6-2, 6-4 win over world No. 1 Rafael Nadal in the semifinals here on Saturday.

With the crucial win, Del Potro also secured a berth in the ATP World Tour Finals.

Del Potro, who just won an ATP title in Tokyo a week ago, continued his top form and wrapped up the convincing victory in one hour and 46 minutes.

The Argentine giant used only 25 minutes to build up a 4-0 lead in the opening set. Nadal held serve for the first time in the fifth game but it's too far from enough to catch up with Del Potro, who drew the first blood at 6-2.

Nadal revitalized a little in the second set, but Del Potro continued to hit scorching winners from both sides with his deadly forehand. Nadal created four breaking points in the set, but just could not convert on any one of them.

Del Potro took the decisive break in the third game of the set and never really tested in the remaining time.

By reaching the final at Shanghai, the Argentine also got the ticket to the ATP World Tour Finals, which will be contested by the world's best eight players.

Earlier, top seed and defending champion Djokovic withstood a strong challenge from seventh seed Jo-Wilfried Tsonga of France to prevail 6-2, 7-5.

The opening set proved to be a routine job for the defenidng champion, but he had to deal with a surging comeback from the Frenchman before sealing the victory in one hour and 33 minutes.  

"It's important for me to get into another final," the Serb said in a post-match television interview, adding that he was pleased with his return game and serving at key moments.

"My serving was very controlled, very efficient. I was trying to open up the court and move him around. I know he likes to have targets, he likes to play from the backhand corners so I tried not to let him into that comfort zone."

Djokovic owns a 9-3 edge in the ATP Head2Head against Del Potro with the Serb prevailing in their most recent meeting, a five set thriller in the Wimbledon semifinals this year.