Our experts have put their heads together to create a five-team shortlist for Sport360's International Sportsman of the Year for 2015.
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The Serb world number one has been utterly dominant in 2015, winning 82 of 88 matches and claiming three of the four Grand Slams (Australian Open, Wimbledon and US Open).
Losing the French Open final is his only Grand Slam blotch over the past 12 months, with Djokovic claiming 11 titles, a record six Masters 1000 tournament wins, 31 victories over top-10 opposition and a record-breaking haul of prize money.
Djokovic certainly raised the bar in 2015, producing one of the finest seasons in the history of tennis.
Part of golf’s new “Big Three” alongside Rory McIlroy and Jason Day, American Spieth has been at the forefront of ushering in golf’s new era.
The 22-year-old won his first Major at The Masters in April, before quickly doubling his tally with the US Open crown in June.
Spieth went on to finish fourth and second at the final two Majors (The Open and PGA Championship respectively), to highlight the consistency which saw him rise to number one in the world.
What more can be said of Steph Curry and his Golden State Warriors?
Both player and team have swept all before them, taking the 2015 NBA Championship in June before going on a 24-game unbeaten run to kick off the new season – a run that was only ended on Monday morning.
Curry has been at the heart of his team’s superb run, leading the average points per game so far this term with a remarkable 32.3.
A La Liga, Copa del Rey, UEFA Super Cup and Champions League quadruple was just reward at club level for the Argentine.
Messi will be disappointed to have fallen short of Copa America glory with Argentina but the playmaker was far more instrumental in their run to the final than he has been in previous international tournaments.
In yet another year of landmarks, Messi has scored 50 goals in 59 appearances for both club and country. Not bad at all.
Despite dropping off somewhat in the last three weeks of the season, Hamilton was by far the best driver in Formula One this season.
In his all-conquering Mercedes, the British driver secured the drivers’ championship for the second year in succession and his third overall, bringing him level with his childhood hero, the great Ayrton Senna.
Hamilton finished 59 points clear of team-mate Nico Rosberg in second-place, winning ten of the 19 races over the course of the 2015 F1 season.
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