AmaZulu collected three points following a 1-0 Premier Soccer League win over Golden Arrows at King Zwelithini Stadium.
Arrows were awarded a penalty in the second minute of added time before the halftime break, but Junior Dion missed.
Usuthu broke the deadlock in the 56th minute when Riaan Hanamub scored with an assist from the new signing from Cape Town Spurs, Liam Bern.
AmaZulu managed to win despite suffering an injury setback in the 27th minute when Olwethu Mzimela was injured. He was replaced by Darren Johnson.
Zwane's side is now fourth on the PSL standings with 24 points, two more than Kaizer Chiefs, who are fifth with 22 points. Amakhosi, however, can go up the logs if they beat Chippa United on Wednesday.
Meanwhile, Arrows, guided by former Sundowns coach Manqoba Mngqithi, are 10th with 16 points.