el Potro (pictured) benefited from Frenchman Jo-Wilfried Tsonga's victory against American James Blake in the semi-finals of the Paris Masters.
The result meant that the Argentine was guaranteed to finish the week within the top eight in the ATP Race.
Del Potro joined Rafael Nadal, Roger Federer, Novak Djokovic, Andy Murray, Andy Roddick and Nikolay Davydenko as the players qualified for the season-ending tournament, which will start in Shanghai on November 9.
The last spot will go to the winner of Sunday's final between Tsonga and Argentine David Nalbandian.
