FA Cup fifth round: Live score, team news and updates

You can’t play Leeds every week, Antonio.

It was always likely that Saturday’s 4-0 stroll at Elland Road was a something of an illusion when it came to assessing the return to form of Antonio Conte’s Tottenham.

And so it proved during this FA Cup exit to Championship Middlesbrough, for whom teenage substitute Josh Coburn smashed a deserved winner in extra-time.

Josh Coburn sealed a magnificent win for Middlesbrough as they dumped Tottenham Hotspur out of the FA Cup

The teenage substitute scored at the start of the second half of extra time with a thunderous finish past Hugo Lloris

Having already knocked out Manchester United, Middlesbrough have taken another top flight scalp with Antonio Conte's side

Spurs, though, were poor, reverting to the clueless bunch who had lost four in five before their weekend reprieve.

Conte came into this game claiming his threats to quit last week were a strategy designed to bring about improvement in his team. Likely story. It was as calculated as a toddler tackling algebra.

The Spurs boss, rather, was in a huff following defeat at Burnley and only victory at Leeds restored his rationale.

But if Conte was to maintain the idea that his motivation was to impart a winning mentality on his players, naming a weakened team here would not tally, especially as the competition was their only hope of ending a 14-year wait for silverware. That is why Spurs were at their strongest, unchanged from Elland Road.

Not that you would have known during a first half in which they failed to register a shot on target. To think, they were 3-0 up after 27 minutes at Leeds.

Tottenham stars including Sergio Reguilon look on after suffering yet another cup competition exit to lower opposition

Tottenham are also on a horrendous run of form having lost five of their last six games across all competitions

Son Heung-min and Steven Bergwijn both missed opportunities for Spurs during the entertaining FA Cup fifth round tie

Matt Doherty should have scored for the visitors when rounding the stranded goalkeeper Joe Lumley. But, with the angle against him, his 20-yard finish was erratic and wedged high over the crossbar.

Boro boss Chris Wilder, perhaps with one eye on next season, had challenged his players to prove they could compete with top-flight opponents, referencing what he did at Sheffield United by turning a team of EFL journeymen into Premier League stars.

And, during an opening 45 minutes in which they shaded possession, the Teessiders did just that. They certainly showed more competence and cohesion than Leeds, albeit without troubling Lloris.

Kane, outstanding on Saturday, was having trouble simply standing up here. One routine chance to control and turn in the first half ended up with his slipping on his backside, much to the enjoyment of a sell-out crowd otherwise deprived of entertainment.

His second half began with a similar episode of ignominy. With Lumley’s gloves braced for their first involvement of the evening, Kane sized a free-kick 20 yards out. Again, however, the England captain was left in an embarrassed heap on the turf, his scuffed effort barely making the defensive wall. Cue home laughter.

Matt Doherty fired over the crossbar for Spurs having beaten Boro keeper Joe Lumley (not pictured) to a loose ball

But Middlesbrough were the better team across the game and racked up plenty of chances to win in normal time

Dejan Kulusevski was a lively presence in an otherwise stunted Tottenham Hotspur attack at the Riverside Stadium

A theme was emerging and, when Kane peeled away in celebration just before the hour having turned in from close range, his oblivion to an offside flag was again the source of much amusement.

At least by this point we had a contest worthy of its prime-time terrestrial broadcast and Eric Dier finally drew a save from Lumley with a free-kick destined for the top corner.

But it was Boro who should have led when Crooks strode unmarked onto Jonny Howson’s corner only to somehow head over from four yards. Wilder searched for answers in the bottom of a Lucozade bottle - how he may have wished it was something stronger given the unfathomable nature of the midfielder’s miss.

Harry Kane had a goal correctly ruled out for offside for the visitors who were largely dominated by the Championship side

Antonio Conte is on a miserable run as Spurs boss, as he watched his last chance of silverware this term slip away meekly

Wilder sent on Arsenal loanee Folarin Balogun in pursuit of a late winner and the American forward might have found it had the ball not bobbled and ballooned over when he connected from 12 yards.

Normal time closed in a frenzy of chances, the best of them a header for Howson glanced wide when, like Crooks, he found himself unattended from a corner.

Extra-time was all about Boro, too, and they followed up on their fourth-round victory at Manchester United when Coburn swapped passes with Crooks and drilled beyond Hugo Lloris in the 107th minute.

It was a convincing finish from the academy graduate. Spurs, meanwhile, were anything but.

The FA Cup fifth round gets underway to provide the midweek drama, with three ties including Manchester City's trip to Peterborough United all featuring on Tuesday. 

The Championship's bottom side will be hoping to cause a huge shock against the Premier League champions, as will Middlesbrough when they host Tottenham Hotspur.

Crystal Palace will also be targeting a quarter-final place when they host Stoke City.

Follow Sportsmail's DAN RIPLEY for live FA Cup fifth round coverage including build-up, team news and updates. 

Elsewhere, Burnley and Leicester are also going head-to-head in the Premier League, which we'll keep you up-to-date with.