The league leaders had a first meaningful chance on the second minute in which they won a free kick almost 30 meters out.
The opportunity was wasted as midfielder Ibrahim Ajibu’s shot went into Prisons keeper Aron Kalambo’s hands.
Prisons made their way into Yanga’s area on two occasions thereafter, the latter’s defenders stood firm to foil the moves.
Prisons threatened to pull an opener on the 20th minute as Yanga keeper Ramadhan Kabwili punched a looping header by the former’s striker Adam Adam.
Yanga went 1-0 up two minutes later, as midfielder Papy Tshishimbi headed in a well taken free kick by Ajibu taken a few meters from Prisons’ box.
Yanga won the free kick after Prisons’ defender Leonce Mutalemwa had fouled the former’s fullback Paul Godfrey.
Prisons goalie Kalambo had to come out of his comfort zone to save a dangerous center by Yanga left fullback, Jaffary Mohamed on the 24th minute.
Prisons levelled matters through striker Ismail Kada on the 32nd minute, as he banged in a well taken corner kick by midfielder Salum Kimenya.
Kalambo stood firm to collect a weak header by Yanga striker Heritier Makambo several minutes later, preventing the opponents from registering the second.
The visitors went close in which Kada outpaced the hosts’ defenders, he could however only direct his right foot effort to the side net.
Godfrey made quick interchange of passes with midfielder Tshishimbi a few minutes before the breather and the latter released the former, whose cross was easily saved by Kalambo.
The opening stanza ended with the two squads scoring a goal apiece.
Prisons could have notched a second on the 49th minute as Adam got the better of Yanga defenders, he though blasted over.
Ngassa released Makambo on the 62nd minute, a left foot shot by the forward was cleared by Kalambo.
Yanga went 2-1 up on the 65th minute, as Makambo connected a center by Ajibu with a firm header.
The Congolese striker, for that matter, brought his goals’ tally to 16, equaling Simba striker, Meddie Kagere, and Mwadui forward, Salim Aiyee.
Second half substitute, Mwinyi Haji, whipped in a good cross on 74th minute, Kalambo collected it to frustrate Yanga forward that had sped into the area to slot home.
The visitors squandered a chance to pull an equalizer during the closing stages of the game, in which Kada could only manage a weak right foot shot from close range, hardly troubling Kabwili.
The Dar es Salaam giants as well had the last laugh in the league’s first phase match, which took place at the Sokoine Stadium last year, winning 3-1.