VIENNA  - Juan Del Potro is optimistic about his chances to qualify for the year-end World Tour Finals next month as the top seed prepared on Tuesday to begin his autumn indoor campaign at the Austrian Open.

The Argentine stands provisional seventh in a season points chase which has three more weeks to run before the start of the eight-man event on November 5 in London. He begins at the Stadehalle against the winner from a pair of qualifiers, German Daniel Brands or Belgian Ruben Bemelmans.

Three London spots are open, but the likely injury absence of Rafael Nadal could mean that four more players have a chance to reach the field. Del Potro wants to be one of them.

"I'm very excited about trying to qualify, I need to do well here and at my next event (Basle) in order to have a chance though," the Argentine said as he continued training at the tournament where he lost the final a year ago to Jo-Wilfried Tsonga. "I have to play consistently this week, it would be great to win the title here for the first time. That would help my chances," said the 24-year-old, who is competing for the first time in a month after dealing with a left wrist injury.

"I followed my rehab programme in Buenos Aires and did it well," said the 2009 US Open winner who then missed most of the next season with a right wrist problem which required surgery.

"I was working with both my doctor and my physio. "Right now I'm feeling fit and healthy," said Del Potro, winner of two trophies in 2012, including indoors in Marseille. "I'm hoping for my first title here on my third try."

Del Potro trails Czech Tomas Berdych, provisional sixth in the race to London and heading Tsonga plus Vienna second seed Janko Tipsarevic.