Dieng was in the thick of the action at the Riverside where the Rs managed to hold on to the lead despite his dismissal with 32 minutes remaining.
The visitors started the stronger of the two, even though there was very little for Middlesbrough’s league debutant Jordan Archer to do before the opener.
Archer, signed from Motherwell in January, was beaten from 30 yards in the 15th minute when centre-back Rob Dickie was allowed too much space to roam into the final third and score a screamer.
And after Darnell Fisher and Djed Spence had got into good positions for the home side, Archer was soon beaten for a second time at the other end.
Striker Lyndon Dykes swivelled in the area before half-volleying a cross into the six-yard box for Lee Wallace to nod down and beyond the goalkeeper.
But Middlesbrough made them work hard for the win after Yannick Bolasie pulled one back with a header of his own in the 28th minute.
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LUKE BOOSTED BY WALES ACE LIAM
Swans bid to mark new era in style...
MATT'S DELIGHT OVER RECORD
WYCOMBE boss Wanderers Matt Bloomfield hailed his history-makers after victory at Lincoln City.
TON-UP IAN ENJOYS HIS SPECIAL WIN
AN Evatt described his 100th win as Bolton boss as very special, although he needed Aaron Collins' injurytime goal to bring up the three figures.
DONS LACK A CLINICAL EDGE AS SADDLERS GRAB POINTS
NATHAN Lowe's strike inspired promotion-chasing Walsall to victory over AFC Wimbledon at the Cherry Red Records Stadium.
SUB GRIMES IS IN-SPIRED TO HEAD THE WINNER
CAPTAIN Jamie Grimes headed in a late winner for Chesterfield after a game of very few chances appeared destined to remain goalless.`
COBBLERS TEST IN TROPHY FOR POSH
HOLDERS Peterborough United have been drawn against fellow League One side Northampton Town in the Round of 32 of the newly-named Vertu Trophy.
HORNETS REMINDED OF GRAY'S BRILLIANCE
WAYNE Rooney expressed his delight as Plymouth extended their unbeaten league home run to six after Andre Gray's last-gasp leveller.
MARTI DOUBTING JOB AFTER DRAW
Rangers home run continues
BIG MAC'S ON TARGET TO SEE OFF THE TIGERS
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Rohl confident Owls
DANNY Rohl said getting results is the only thing missing as his Owls were held at home by Cardiff.