Cursed by the "Golden Generation" tag for their last two worldwide tournaments, Belgium have been seen as underachievers given the wealth of talent at their disposal.
Lukaku's brace puts him joint top with Portugal's Cristiano Ronaldo in the race for World Cup golden boot.
BMW 6GT now available in Diesel
The 6 GT is meant to be BMW's answer to the Mercedes-Benz E-class in India, which is only available in long-wheelbase form. The gearbox is 8 speed, torque converter automatic from ZF, known for its rapid yet smooth shifts.
Group G wasn't expected to be a close one, with most assuming Belgium and England would roll past the competition to set up a showdown on the final matchday.
Chelsea forward Hazard, who was named the man of the match, said: "I think the match was easy because we scored after five minutes and we knew Tunisia needed to win and would leave spaces and would be open".
Get the latest World Cup news updates. Tunisia - thrashed 2-1 by England on Monday - face Belgium, who many people think will go all the way.
Hazard hit the ball low and left past Tunisia goalkeeper Farouk Ben Mustapha to give Belgium the lead.
Alli remains a doubt for Panama clash
Walker said Holland had apologised to the squad at Friday's training session for allowing the picture to be taken. Tunisia like to play the ball out from the back and were very patient but Panama are probably more direct.
Roberto Martínez said Eden Hazard and Dries Mertens were also hurt, picking up calf and ankle injuries respectively. "The first game at any tournament is always a little tough and the heat also exhausted us out but after rest we'll be ready to roll again", Chelsea playmaker Hazard said in the build-up to the weekend's clash.
Although it remains guesswork at this stage, the pool winners could end up facing the victor of Brazil and Germany in the last eight, while the runners-up may get one of Mexico, Sweden or Switzerland assuming they dispense with the victor of Group H in the last-16.
'He was hiding away on his own up front in the first half.
Vidéo - Un prêtre gifle un bébé lors d'un baptême!
Ce prêtre, âgé de 89 ans , a aussi expliqué que la cérémonie se passait bien jusqu'au moment du baptême en lui-même. Elles ont pris des mesures conservatoires contre l'homme de Dieu qui a eu un comportement qui a choqué plus d'un.