Saba were comfortable 3-0 winners over out-of-sorts visitors Saipa, with Karim Eslami opening the scoring eight minutes into the second half and Milad Soleiman Fallah adding the gloss with two strikes in the last 10 minutes.
Waleed Ali scored just before the break and Farhad Majidi added one just after as Esteghlal enjoyed a commanding win of their own.
Saba and Esteghlal are level on 10 points from four games.
Damash led twice but lost 3-2 at home to Teraktor Sazi as Seyed Mohsen Hosseini equalised twice before Mohammad Ebrahimi's winner five minutes from time.
Zob Ahan won 1-0 at home to Foolad, Omid Ebrahimi's brace saw Sepahan win 2-0 at Shahrdari Tabriz and Naft Tehran drew 2-2 at home to Rah Ahan.