Obiero, who is continuing to have good times since making his Kariobangi Sharks debut, made two quick saves in the 19th minute to deny Mathare s Lennox Ogutu and David Ochieng.
Kariobangi Sharks almost doubled the lead in the 25th minute when top scorer Erick Kapaito collected a poor clearance by Mathare s backline but his effort was stopped by the woodwork.
Lwasa, however, added the second goal for the visitors a minute past the half-hour mark with a low drive to punish a rather disjointed Slum Boys.
In the 52nd minute, Ochieng s free-kick flew just above the crossbar as Mathare United made their first attack of the second half.
Goal. For me, age is not important but the quality of the player. Even if you are a 16-year-old but with quality, I will play you. For me, the most important thing is the quality of the player.
[Against Mathare], I gave an opportunity to [Alphonse Onyango]. He came, played well, and scored. It is good to give the upcoming players an opportunity to play because it will give them confidence and I believe they will be better in the future.
The Portuguese tactician hopes to have some new players to improve the team but has promised to work with the available ones if his wish is not granted.