Santos fires home his second and Tunisia's third goal
Tunisia 3-0 DR Congo
Hosts Tunisia booked their place in the last eight and ended DR Congo's hopes as substitute Francileudo dos Santos scored twice in a 3-0 win.
Santos took his tournament tally to three as Tunisia took advantage of Lomana LuaLua's first-half dismissal.
Tunisia took advantage as Santos drove home after Hatem Trabelsi's cross was dropped and Najeh Braham headed the second from a wayward Santos shot.
Santos sealed victory late on, firing home following Kaies Ghodhbane's pass.
While LuaLua's red card was pivotal, the introduction of defender Trabelsi as a substitute inspired Tunisia.
55 mins: Santos makes the breakthrough for the hosts
66 mins: Braham heads home the second
88 mins: Santos seals victory with neat finish
Trabelsi came on at the start of the second half to set up the opening goals.
His cross found Santos 10 minutes into the second half, and the striker turned home after Congo keeper Papy Lukata fumbled.
Trabelsi is on the mend for an ankle injury and the game was his first 45 minutes in almost three months.
And the defender was again the provider as Brahem scored the second goal for Tunisia, heading home from close range from an attempted Santos bicycle kick.
But Santos was the hero again as he became the tournament top scorer with three goals following his second of the game in the 87th minute.
He put the ball between the legs of Lukata after Ghodhbane's low through ball had put him clear.
LuaLua's dismissal came after he used his heel on Mnari, although the Tunisian player's reaction was clearly simulated.
Brief scuffles followed as LuaLua protested his expulsion and members of both camps engaged in a free-for-all.
With him went Congo's hopes of an upset after very few chances were created in the first half.
Though the Tunisians were mainly in possession, they had only one clear opportunity through Ghodhbane, who headed from close range straight at the keeper.
LuaLua also headed wide at the other end from a corner, but his best chance of the half was a solo effort that saw him fail to control a bouncing ball before heading into the grateful arms of Tunisian stopper Ali Boumnijel.
Tunisia: Ali Boumnijel, Khaled Badra, Karim Hagul, Imed Mhadhebi (Riadh Bouazizi 78), Mehdi Natfi (Hatem Trabelsi 45), Najeh Braham, Kais Ghodhbane, Jawhar Mnari, Mohamed Jedidi (Silva dos Santos 17), Anis Ayari, Karim Saidi.
DR Congo: Papy-Shumu Lukata, Camille Muzinga, Kitambala Mubiala, Jean-Paul Kamudimba, Tresor Luntala, Diego Kalulika, Lomana LuaLua, Ekakanga Masudi (Niati-Polo Nzuzi 79), Dinzey Sinda (Frank Matingou 44), Herita Ilunga, Kibemba Mbayo (Mbomboko Ngoy 59).
Referee: Jerome Damon (South Africa)