You know your career has been a roller coaster ride when you are in the running for the ATP's Comeback Player of the Year for the second time. Juan Martin del Potro, the 2009 US Open champion, is among the nominees for the year-end award. He originally won it in 2011 following a near year on the sidelines in 2010. On Monday the ATP announced that he was in the running again.

When del Potro's on the court the story is often about how lethal his forehand is. However, when he's off the court, a key body part in that forehand - his wrist, is often being looked at by doctors. The Argentine has had multiple surgeries on his wrist, procedures that have cost him scores of weeks in his career.

After starting February of this year ranked outside of the top 1000 on tour, del Potro has worked his way back to the World No. 63 position. He would be a lot higher than that if the ATP offered ranking points for the Rio Olympics, as they had done back in 2012 in London. His season highlight remains his run to the Rio final where he won lost to Andy Murray. In doing so, the Argentine picked up a prestigious silver medal to add to his 2012 bronze medal from London.

Other highlights from 2016

Del Potro didn't actually win a title in all of 2016, a point in favor of him not winning the award for a second time. However, he had numerous match wins over high-ranked players.

For instance, del Potro defeated 2nd-ranked Andy Murray in Glasgow about a month ago as part of Davis Cup play.

Del Potro defeated both Dominic Thiem and David Ferrer at the 2016 US Open. Furthermore, in Rio the Argentine defeated both World No. 1 Novak Djokovic and World No. 5 Rafael Nadal. At Wimbledon, the former Grand Slam champion took Stan Wawrinka out of the draw in the second round.

Other nominees for the award this year

The ATP defines the Comeback Player of the Year Award in the following way: "The player who has overcome serious injury in re-establishing himself as one of the top players on the ATP World Tour." Other nominees besides del Potro includeJulien Benneteau, Ivo Karlovic, and Florian Mayer.

Benneteau might be a tough sell to win as he is currently just 7-13 on the season and ranked outside of the top 200. Florian Mayer had an impressive run in his comeback as he won Halle, a major tally in his favor over the title-less del Potro. Karlovic has two titles on the year, but he's a strange nominee in the sense that he was never off the radar. He finished 2015 ranked in the top 25 and he's been in the top 30 nearly every week since. You could argue that he never had to re-establish himself in a comeback this year, because he never really fell down in the rankings much.

The way I think it goes is as follows: (1) del Potro, (2) Mayer, (3)Karlovic, and (4) Benneteau.I see the Argentine winning this award, because of his presence in Rio and Flushing Meadows(l.

in quarters). Furthermore, the collection of defeats against the high-ranked players following so much missed time defines him as re-established.

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