Ittihad and nassr were always become the main rivals for al hilal. I can hope that if al hilal will keep the current position till the end of season. The club needs also to make sure its opponent will not be lucky enough to win the game and al hilal can take such opportunity to climbing up.

There will some matches to come soon. Al ittihad will be facing al ahli which is becoming the most attractive match for this week. Al naasr and al hilal will be facing some weak teams.
It's unlikely al ittihad will be able to win the game against al ahli easily.
My pick for this week obviously
Al nassr
Al Ittihad
Al hilal.
From some of the matches you mentioned it seems like you should be little more careful when placing bet on Al-Ittihad match because against Al-Ahli, they are not weak club and if you choose to bet Al-Ittihad you will run the risk of draw because after all Al-Ahli has very strong defense strong and in upcoming match it is better to choose another option such as both club scoring it would be better because both clubs will score at least 1 goal each.
For Al-Nasr and Al Hilal your choice is right but you will only get very small odds and for me you have to look for other alternative options to get slightly higher odds.
It looks like the match between the top clubs will change position in points table and I am worried that Al-Ittihad will be replaced by Al-Nasr or Al Taawon who are facing weak club.