Join the debate at #bbcafcon2015published at 19:15 Greenwich Mean Time 23 January 2015
Nathan Titus: Need to be sticking those chances away, South Africa.
Mbodji levels with powerful header
Senegal on four points; SA on one
Ghana beat Algeria 1-0
Gyan scores late winner on return from malaria
Ghana now on three points with Algeria
James Gheerbrant and Emlyn Begley
Nathan Titus: Need to be sticking those chances away, South Africa.
Senegal's Papakouli Diop swings in a searching free-kick from the left flank, but it's headed clear well by South Africa.
From the corner, Senegal allow Erik Mathotho a free header at the far post, but his effort is blocked by a brilliantly nonchalant backheeled clearance.
Lovely build-up from South Africa, neat one-touch interplay creates a shooting chance for Sibusiso Vilakazi, who brings a save from Bouna Coundoul.
Again Senegal look long. Stoke's Mame Biram Diouf is the target, but he's just offside. A somewhat cagy opening in Mongomo.
On the evidence of the early stages, South Africa look to be the more methodical of the sides, happy to pass their way through midfield. Senegal by contrast are not afraid to try and spring their fleet-footed attackers over the top.
Senegal's Sadio Mane makes a good driving run from midfield and Thulani Hlatshwayo does really well to intercept his attempted through-ball.
South Africa's Erick Mathotho is down after a nasty collision with Cheikh M'Bengue. Replays show the Senegal player catches him accidentally with a knee to the back of the head. It looks like he'll be OK to continue.
Immediately Sibusiso Vilakazi has a half-decent chance for South Africa as he meets Tokelo Rantie's right-wing cross, but he steers his effort over the bar.
South Africa, playing in yellow shirts and green shorts, kick us off. Can they put the memories of their opening-day defeat behind them? Senegal in white.
Just spotted an amazing comment over on our Facebook page., external
Thabang Mawela: Asamoah Gyan, for the longest time has been the most underrated player of all time in world football. He has never played for a big club like the Ivorians have, yet he is forever consistent for his national team. I'm not even Ghanaian, just a fan of the game that recognises true talent.
South Africa were unlucky to lose their opening match against Algeria. They dominated for long periods, but saw a penalty miss prove costly as they squandered a 1-0 lead to lose 3-1.
This squad have plenty to play for after captain and goalkeeper Senzo Meyiwa was murdered on the eve of the tournament.
However, coach Shakes Mashaba knows that defeat this evening would deal a huge blow to his side's qualification hopes, with all the other teams in this group now on three points.
BBC Sport's Matthew Kenyon in Mongomo
"How much drama can you take for one night? A last-gasp winner for Ghana seems to have been enough for some people - it's thinned out a bit. Meanwhile it's goosebump time as South Africa's national anthems rings out. Surely one of the best in the world...
"Other national anthems are available (Senegal's included) and that's ringing around the ground now..."
Senegal have the chance to take a firm grip on this group following today's earlier result. They showed impressive resilience in their opening game, coming from behind to beat Ghana 2-1 courtesy of a last second-winner from Moussa Sow.
Coach Alain Giresse is blessed with a rather top-heavy squad that includes, among an embarrassment of striking riches, Southampton's Sadio Mane and Newcastle's Papiss Cisse, as well as Stoke's Mame Biram Diouf.
It's at the back that their traditional weaknesses lie, though West Ham's Cheikhou Kouyate has to make to do with a place on the bench despite his impressive season.
Ghana coach Avram Grant has been asked about matchwinner Asamoah Gyan: "He was not fit - he didn't train like he needed to - but he's Asamoah Gyan, if you look at the stats and his behaviour in the dressing room. You know I have been coach of some of the great players - he's one of the greatest. First - he always scores when you need him. Second - he's good for the spirit of the team - he's a very good captain."
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South Africa announced their line-up several hours before kick-off.
They made two changes from their opening 3-1 defeat by Algeria. Keeper Darren Keet is dropped in favour of Jackson Mabokgwane and Erick Mathoho comes into central defence for the injured Rivaldo Coetzee.
Senegal make five changes from their win over Ghana. Moussa Sow, the man who scored that last-gasp winner against the Black Stars, comes into the starting line up - as does Southampton's Sadio Mane - who was an injury doubt in the build up to the finals. Amongst those giving way, Dame Ndoye and Cheikou Kouyate.
South Africa: Mabokgwane, Hlatshwayo, Mathoho, Ngcongca, Matlaba, Furman, Vilakazi, Manyisa, Jali, Phala, Rantie. Subs: Keet, Nhlapo, Masango, Zungu, Ndulula, Letsholonyane, Sangweni, Parker, Zwane, Phungwayo, Khuzwayo.
Senegal: Coundoul, Ludovic Sane, M'Bengue, Mbodji, Gassama, Diop, N'Diaye, Gueye, Diouf, Mane, Sow. Subs: Gomis, Djilobodji, Kouyate, N'Doye, Badji, Toure, Cisse, Souare, Konate, Salif Sane, Saivet, Camara.
We will now turn our attention to South Africa v Senegal in the group's second match of the day. That kicks off in 30 minutes.
Was that the dramatic moment of the tournament so far? Was it the worst game?
Let us know using #bbcafcon2015 or via text 81111.