Romelu Lukaku and Eden Hazard both scored twice as Belgium sent out a message about their World Cup credentials with a 5-2 win over Tunisia on Saturday.
Hazard opened the scoring from the penalty spot (6) before Lukaku doubled their lead (16) with a tidy finish.
Dylan Bronn headed Tunisia back into the game (17) but Belgium always carried a huge threat in attack and Lukaku finished off a counter-attack to re-establish the two-goal cushion (45+3) with his fourth goal of the tournament.
Hazard added another (51) following a wonderful Kevin De Bruyne pass and Belgium could afford substitute Michy Batshuayi to miss a hatful of late chances, although he did finally score in injury time (90), as they all but guaranteed their spot in the last 16.
Whabi Khazri scored a consolation (90+3) for Tunisia, who, barring a minor miracle, are out of the World Cup following two straight defeats.
One potential worry for Roberto Martinez was Lukaku hobbling off with an ankle problem early in the second-half.
Belgium play England on Thursday in their final Group G encounter.