Juan Martin del Potro happy with 2013 season

Juan Martin Del Potro celebrates his win against Paul-Henri Mathieu during their Swiss Indoors quarter-final tennis match on October 25, 2013
Juan Martin del Potro reflects positively on his 2013 season despite a group-stage exit at the ATP World Tour Finals in London.

Juan Martin del Potro has reflected on a "great" 2013 season following his exit from the ATP World Tour Finals in London.

The Argentine fell 4-6 7-6 7-5 to Roger Federer in yesterday's final group game.

However, four more titles this year - taking his career total to 17 - saw him finish in the top five, with Federer dropping out of the four-man monopoly at the top of the rankings.

Del Potro said that he will be working hard to close the gap on Rafael Nadal, Novak Djokovic, Andy Murray and David Ferrer ahead of him.

"For this year, my goal was trying to play in the same level [as] the top guys," the 2009 US Open winner told reporters. "I am the only player who beat all of them in this season, which means something for me.

"I think I did a great season. Maybe I [will] finish in the top 5 after three and a half years. [It] is really good [to] see my ranking and my name in the top positions."

"They don't beat me easy, and I beat [them in] some tournaments. All the matches are close, but in the end they still beat me because they have a little difference. I will be working hard on that."

Federer will Nadal in the first ATP semi-final, while Djokovic takes on Stanislas Wawrinka in the second.

Roger Federer celebrates his win over Juan Martin Del Potro during the quarter finals of the Paris Masters on November 1, 2013
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ATP RankingsPoints
1Scotland flag Andy Murray7,750
2Spain Rafael Nadal7,555
3Switzerland Roger Federer7,145
4Switzerland Stanislas Wawrinka5,780
5Serbia Novak Djokovic5,325
6Croatia Marin Cilic5,155
7Alexander Zverev4,470
8Austria Dominic Thiem4,030
9Japan Kei Nishikori3,285
10Canada Milos Raonic3,230
11Bulgaria Grigor Dimitrov3,070
12France Jo-Wilfried Tsonga2,770
13Belgium David Goffin2,560
14Spain Roberto Bautista Agut2,425
15Czech Republic Tomas Berdych2,390
16United States Jack Sock2,335
17Pablo Carreno Busta2,305
18Lucas Pouille2,220
19United States John Isner2,110
20United States Sam Querrey2,060