By Dan King - Newcastle United Digital Editor
At the Stadium of Light
Sunderland Under-21s 2 (Laidler pen, Smith)
Newcastle United Under-21s 0
Newcastle suffered their second derby defeat in the space of three days as they lost to Sunderland in the Barclays Under-21 Premier League.
After shading a tense first half, United went behind to a controversial penalty before conceding a second in stoppage time at the Stadium of Light.
It took until the 24th minute for either side to fashion an opening, when Remie Streete won a free kick and Adam Armstrong's delivery was headed wide by skipper Paul Dummett.
Then Michael Richardson's powerful shot from the edge of the area was saved by Jordan Pickford before Alex Gilliead glanced wide from a Jonathyn Quinn cross.
Richardson saw a shot deflected into Pickford's arms, then the same players headed too close to the goalkeeper from Greg Olley's ball in before shooting wide on the turn moments later.
Jordan Laidler thought he'd won a penalty for Sunderland when he went down under Jak Alnwick's challenge but referee Andrew Miller rightly waved play on.
Then a Streete header from Armstrong's left-wing corner dropped just over the bar before Laidler flashed wide.
Newcastle started the second half well as Gilliead had a low strike saved then another effort blocked by former Darlington defender Scott Harrison.
The Black Cats came within a whisker of taking the lead when George Honeyman fired across goal and Laidler couldn't divert home but United sub Callum Roberts should have done better than stab wide at the far post on the hour.
Connor Oliver was denied by Alnwick, then Tynesider Louis Laing fired over from 20 yards before the home side were awarded a spot kick.
Streete fouled Oliver but it appeared to be outside the box; however Miller pointed to the spot and Laidler made no mistake from 12 yards.
And the home side finished on top with Ross Holland and Laing both trying their luck before Alnwick made a smart stop from sub Martin Smith.
But Smith scored from Lynden Gooch's pass in the final seconds to seal Sunderland's win in front of a crowd of 1,168.
Sunderland Under-21s: Jordan Pickford, Andrew Cartwright (Martin Smith 70), David Ferguson, Connor Oliver (Tom Beadling 72), Scott Harrison, Thomas McNamee, Adam Mitchell, Louis Laing, Jordan Laidler, George Honeyman, Ross Holland (Lynden Gooch 77)
Subs not used: Carl Lawson, Joel Dixon
Newcastle United Under-21s: Jak Alnwick, Jamie Sterry (Olivier Kemen 58), Paul Dummett, Remie Streete, Paul Dummett, Jonathyn Quinn (Callum Roberts 58), Lubo Satka, Greg Olley, Alex Gilliead, Michael Richardson, Adam Armstrong
Subs not used: Jonathan Mitchell, Macauley Booth, Steven Logan