Minecraft 1.9.2 Command /testfor SelectedItem. Need Help

I am trying to use the command:

/testfor @a {SelectedItem:minecraft:fire_charge,display:{Name:"Fireball"},ench:[{id:60,lvl:10}]}

In a command block it always ends up saying player did not match the required data structure. This is making me so angry not knowing what I'm doing wrong.

In order to obtain the fire charge I use the command:

/give @p minecraft:fire_charge 1 0 {display:{Name:"Fireball"},ench:[{id:60,lvl:10}]}

This one always works and gives me the correct item. It just can't find when I have it as a selected item in my hotbar (item in my hand so it can be used).

Please help me out. Thank you for taking your time to help (in advance).