This is may be the simplest strategy for sports bets, which is at the same time quite reliable. Its main presumption is that you determine the amount for bets and you bet the exact percentage every time, which is available from that amount.
For example, if you have 100$ for sports betting and you decide to bet 20% for each bet, after the first loss you will have 80$ left. Your next bet will be 16$, etc. The advantage of this method is that you will never loose all of your money.
You can modify this method by separating the money for the different types of betting, for example 5% of your bank for combined bets, 15% for single bets, etc/
It is recommended that your general betting percentage is nod exceeding 25% of your bank.
You can split your bank to different levels, and for each level to set a definite percentage. For example:
0-100$ - 10%
101-200$ - 15%
201-500$ - 20%
500-1000$ - 25%, etc.
You can try this betting system by opening an account in bet365