After a tough and disappointing year for Roger Federer, he has qualified for the season-ending ATP World Tour finals at the O2 for the 12th consecutive year.

His involvement in the event was in doubt after only winning one tournament this season - the Gerry Weber Open in Halle.

The Swiss maestro has done enough to equal Ivan Lendl's record for successive appearances at the season finale.

After a disappointing year including crashing out of the second round in Wimbledon which ended his streak of 36 consecutive quarter finals at major tournaments, he said: "It's been a tough year so this is a bit of a highlight."

He needed to progress in the Paris Masters tournament to appear at the O2 arena on Monday and he did so in convincing fashion beating Kevin Anderson 6-4 6-4.

There were also victories in the Bercy arena for Rafael Nadal, David Ferrer, Juan Martin Del Potro and Stanislas Wawrinka.

Top seed Nadal, 27, overcame fellow Spaniard Marcel Granollers 7-5 7-5 to reach the third round.

"It's been an extraordinary season so far and I just want to keep it going and finish the year the way that I can," said the French and US Open champion who reclaimed the world number one ranking earlier this month.

Defending champion Ferrer battled past Czech Lukas Rosol 6-0 2-6 6-3, while in-form Del Potro achieved his 14th win from 15 matches by beating Marin Cilic 6-4 7-6 (7-3).

Swiss number two Wawrinka increased his chances of joining compatriot Federer in London after seeing off Feliciano Lopez 6-3 3-6 6-3.

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