There is no sure win in betting.
I have even see 1.01 losing odds before.
If there is a sure win, everyone will bet all their money and sportsbook will be bankrupt.
I have tried some secure bets on djokovic and roger federer on France Open 2015, it went well, but I failed on roger VS wawrinka, the result was unexpected, before the quarter final, bet on djokovic, nadal, murray, the odds were very low, sometimes were even 1.01-1.1, and the bet was secure cos they are best players, but be careful, sometimes some players may win like wawrinka won French Open in the end, although almost nobody bet him.
you dont know me brother i betted on djokovic feeling experience matters the most ..i knew wawrinka is much more older than him and has been soent much time ..but i felt to go with the topper..and i lost i cant tell the amount i have really lost these days..all i want is to recover from the site..so i wanna go atlest less unsecure ones..i might be wrong but not the whole people who gamble.