Rio 2016: 5 players outside the Big Four to look out for

#5. Juan Martin Del Potro

Del Potro has risen up the ranks quickly following his return

The inclusion of the 27-year old Argentine in this list might raise a few eyebrows but given the fact that he has risen 898 places in the rankings in five months since returning back from a wrist injury that ruled him out of the sport for nearly two years, the World No. 144 could be expected to produce an upset or two.He has already beaten a number of higher ranked players since his return which includes a victory over fourth seeded Stanislas Wawrinka at Wimbledon a few weeks earlier. Besides, this isn’t the first time Del Potro has made a comeback from an injury as a previous wrist injury in 2010 saw him move down to 485 in the rankings but he made a stunning comeback in 2011 and ended the year ranked 11th.The big-serving Argentine has a 14-39 record against all members of the Big Four and 12 of those 14 victories have come at hard courts including the win over Roger Federer at the 2009 US Open Final which gave him his first Grand Slam Title. Del Potro won the bronze medal at the London Olympics, beating Novak Djokovic in the bronze medal play-off.

Del Potro might not be able to replicate his form of 2012 but given his quick rise in the rankings, we could expect him to be a dark horse at Rio.