Vita Club sounded a warning to the rest of the CAF Champions League with a crushing 5-0 victory over Simba in Kinshasa on Saturday.
Tanzanian club Simba eased past JS Saoura last week but, back in the competition for the first time since 2003, learned a harsh lesson on the road.
They trailed 3-0 by half-time and struggled to stem the damage after the interval with Makwekwe Kupa's header and Jean-Marc Makusu's second of the match rounding out Vita's convincing first victory of the campaign.
The two sides now share a win apiece in Group D and are a point adrift of leaders Al Ahly.
Group A is even tighter after two matchweeks following Mamelodi Sundowns' steadying 2-1 home win against Wydad Casablanca, the 2017 champions.
Themba Zwane was the hero for the home side as his well-taken brace ensured Mohamed Nahiri's first-half piledriver proved nothing more than a consolation.
South Africa midfielder Zwane's goals came either side of Nahiri's blockbusting effort and left all four teams equal on three points.
Nigerian side Lobi Stars, the team that edged Sundowns 2-1 last time out, earlier slipped to a 1-0 loss away to ASEC Mimosas, who had Ahmed Herve Diamonde's 38th-minute penalty to thank for securing three points.
CS Constantine are enjoying more serene progress in Group C, the Algerian side making it six points from a possible six with a routine 3-0 defeat of TP Mazembe.
Mihayo Kazembe's men held their hosts scoreless during the first half but Houcine Benayada broke the deadlock via a goalkeeping error soon after the interval and Constantine were in control from there.
Nasreddine Zaalani and Sid Ali Lamri wrapped up a comfortable result that leaves Mazembe and second-placed Club Africain three points adrift of the table-toppers.
