To the surprise of nobody, World No. 1 Novak Djokovic of Serbia is the favourite to win the 2016 Australian Open but even more surprising is that the other top favourites—Andy Murray of the United Kingdom, Roger Federer of Switzerland and Rafael Nadal of Spain, are a distant second to fourth, respectively, in the betting odds to win the first majors title in tennis this year.

Here’s a look at the betting odds for each of the top three favourites to win in Melbourne (All lines courtesy of sportsbet.com.au):

Novak Djokovic – 1.67
Andy Murray – 7.00
Roger Federer – 10.00
Rafael Nadal - 12.00

Betting on the Djokovic will net bettors of a profit of $67 (for every $100 bet) while a big $600 and $900 return on Murray and Federer, respectively, with the same amount of bet.

Clearly, the sportsbooks have utmost respect for the Serbian, who has dominated the men’s singles field the last two years specifically, the Australian Open the last six years.

And for good reasons; in the last eight Grand Slam tournaments, Djokovic has made the championship round of six majors tournaments winning four Grand Slam titles—one in 2014 and three in 2015.

Since 2011, or the last five years, Djokovic has made four finals at the Australian Open and won all of those trips to the championship round. The 28-year-old Serbian has a total of five Aussie Open titles winning his first one in 2008 when he beat Jo-Wilfried Tsonga in the final in four sets, 4–6 6–4 6–3 7–6(2).

In 2014, Djokovic lost via an upset in the quarterfinals against eventual champion Stan Wawrinka in a classic five-setter, 6-2 4-6 2-6 6-3 7-9. In his four other wins at the Aussie Open final, Djokovic beat Andy Murray in 2011, 2013 and 2015 and Rafael Nadal in 2012.

As for Murray and 17-time Grand Slam champion Federer, the pair presents the biggest challenge to because of the former’s recent good run that saw his year-end ranking rise to World No. 2 and the latter because of his championship pedigree and history against Djokovic.

As with anything sports, an upset is a probable outcome in any competition and here are the dark horse contenders to win the coveted crown in Australia:

Stan Wawrinka (Switzerland)– 13.00
Kei Nishikori (Japan) – 26.00
Nick Kyrgios (Australia) – 34.00
Milos Raonic (Canada) – 34.00
Tomas Berdych (Czech Republic) – 51.00
Marin Cilic (Croatia) – 51.00

For every $100 wager, that’s a yield of $1,100 if Nadal returns to elite form; and a profit of $3,300 if Australia Kyrgios manages to control his emotions and win the first Grand Slam title in his career.