Sure, what happens is that each player starts with 100AM and you place a certain amount of money on each of the matches listed.
Eg: Say I started with 100AM and place 10AM on Monfils today. If Monfils wins I will get 1/3 x 10= 3.3 Rounding up to the nearest 0.5AM will give me 3.5 AM for that match and so in total I'd then have 103.5 AM.
The competition winner is the player with the most AM by the end of July.