A great return at the end of the year is built on all the great trading decisions you string together and make throughout the year. Month after month if you can minimize drawdowns and continuously build from a higher level the easier it is to get up in the account because you are compounding from a higher level, it requires less work from subsequent winning trades. 

its never about just one trade. The greed to get or force a big win causes you to risk more then necessary and results in larger losses. VS sticking to a pre structured risk allocation limit and never allowing yourself to be in a disastrous destructive situation.

The best traders are always in complete control of their risk. They understand it plan it and execute on it and that's what allows them to win ultimately. They have extreme control over their downside.