Harry Kane marked his World Cup debut with a stoppage-time winner as England made hard work of overcoming Tunisia 2-1 in their Group G opener.

England's talisman and captain put them ahead in the 11th minute of Monday's clash in Volgograd, but Tunisia levelled in contentious fashion.

Referee Wilmar Roldan pointed to the spot when Kyle Walker caught Fakhreddine Ben Youssef with his arm and Ferjani Sassi levelled with an unconvincing penalty.

England wasted numerous opportunities prior to that leveller but will have been unimpressed by Roldan's performance thereafter, the Colombian ignoring multiple penalty appeals from the Three Lions.

Gareth Southgate's men appeared to run out of ideas in the second half, with Tunisia seemingly set to see out what would have been an unexpected draw.

But in the first minute of injury time they made the mistake of leaving Kane unmarked in the box for the second time and he took advantage by heading home at the far post to ensure England start the tournament with a deserved, if unconvincing, win.