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. Hazard added the fourth on the break six minutes after the restart, Michy Batshuayi added a fifth in the last minute before Wahbi Khazri pulled another back for Tunisia.
In scoring twice, Lukaku not only joined Cristiano Ronaldo as the leading marksman in the World Cup with four, he also became the first man since Diego Maradona in 1986 to score successive braces at the tournament.
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. A huge roar goes out from the Belgium supporters as their national anthem is been sung, we are minutes away from the kick-off.
Belgium are ranked third in the world, behind only Germany and Brazil, but Martinez said there was no room for complacency against Tunisian, ranked 21.
Romelu Lukaku, who scored two against Panama, spearheads the Belgian attack, supported by Eden Hazard and Dries Mertens. Belgium can tighten its grip on first place in the group and book a spot in the Round of 16 with a win over Tunisa, which needs to win or draw in order to avoid elimination from World Cup 2018.
Martinez also dismissed suggestions winning Group G may not be beneficial due to the raft of surprise results elsewhere. "We did our best and we will try to improve our performance in the future". Coach Nabil Maaloul has worked on correcting the mistakes against England and the target is to win against the Belgians.
Batshauyi was denied yet again right in front of goal this time, as he struck the crossbar from point-blank range following a fine cross from Carrasco.
"Romelu will try to score as many goals as he can but not at all costs", he said.