Chelsea twice blew a lead against 10-man Burnley to continue their lacklustre form this season in a 2-2 draw on Saturday.
An action-packed afternoon also saw Newcastle come from 3-1 down to stun West Ham 4-3 and Fulham hit back for a 3-3 draw at bottom-of-the-table Sheffield United.
Spurs have now come from behind to win in four of their last five home games and needed another second-half turnaround to keep their challenge for a return to the Champions League next season on track.
Tahith Chong’s strike after just three minutes gave Luton a shock lead, but the Hatters ended the day in the relegation zone as their winless run extended to 10 games.
An Ange Postecoglou half-time substitution again made an impact for Tottenham as Brennan Johnson’s cross was turned into his own net by Issa Kabore just six minutes after the Welsh international’s introduction.
Son had missed a number of chances earlier in the game but finally got some fortune when his deflected effort trickled past Thomas Kaminski for his 15th goal of the season.
Chelsea boss Mauricio Pochettino was met with another backlash at Stamford Bridge after his side failed to make the most of an extra man for the entire second half against second-bottom Burnley.
The Blues appeared on course to cruise to victory after Lorenz Assignon was harshly sent-off for pulling down Mykhailo Mudryk inside the area.
Burnley boss Vincent Kompany was also shown a red card for taking his protests too far.
Cole Palmer coolly chipped in the resulting penalty, but the 10 men levelled two minutes into the second half thanks to Josh Cullen’s super finish from outside the box.
Raheem Sterling had been booed off in Chelsea’s FA Cup quarter-final win over Leicester a fortnight ago but thought he had set up the winner in style with a flick that Palmer stroked into the far corner.
Chelsea, though, failed to hold out again as Dara O’Shea headed in a corner nine minutes from time to leave Pochettino’s men still in the bottom half of the table.
