- Alexis Sanchez nets 42nd minute free-kick to open the scoring.
- Alvaro Negredo equalises five minutes into the second half.
- Mesut Ozil thumps Arsenal back in front.
- Steve Agnew still seeking first Premier League win at Middlesbrough boss.
- Boro winless in the top flight in 2017 and six points from safety.
- Arsenal now seven points adrift of the Champions League places.
- Gunners secure first win at the Riverside Stadium since 2005.
Well that is about all we have time for from this night of Premier League action. We're back later this week with all the games from both the Champions League and Europa League where Leicester City and Manchester United are involved. But until then, goodbye.
That win sees Arsenal jumped into sixth in the Premier League and go with seven points of fourth place Manchester City, with a game in hand. Middlesbrough as six points from safety, second from bottom, with six games to play. A huge take for both sides to achieve their pre-season goals, you feel.
Full time: Middlesbrough 1-2 Arsenal
Not the most swashbuckling Arsenal win but a run of five on the road without three points is ended at Middlesbrough. Alexis Sanchez and Mesut Ozil are the heroes of the night. The home side put up stern resistance and did level through Alvaro Negredo but missed chances in the second half really cost them. Steve Agnew still without a top flight win as a manager.
Hector Bellerin - much maligned last week at Selhurst Park - and Francis Coquelin on to shore up the Arsenal backline as we enter four additional minutes.
Middlesbrough might be the lowest scoring side in the Premier League but they haven't half had some chances to be at least level if not ahead in this game. The latest opportunity comes as Friend diverts a Downing free-kick across goal and Gibson turns it goalwards - only for Cech to get down low to keep it out.
Mesut Ozil hammers Arsenal into the lead for a second time at the Riverside.
Daniel Ayala with another header - not as easy as the one be spurned earlier in the second half - which Cech easily gathers. Five minutes for Arsenal to grind out.
That is eleven goals in all competitions for Mesut Ozil this season - better than he ever managed with Real Madrid in a single season. Food for thought.
Meanwhile, the game has reached a bit of a lull with Arsenal trying to put their foot on the ball while Middlesbrough look very rushed and rattled by going behind for a second time.
GOAL! Middlesbrough 1-2 Arsenal (Mesut Ozil)
No sooner am I bemoaning the German than he pops up with what could be the winning goal. Aaron Ramsey chests down Sanchez's dinked cross and lays it on a plate for Ozil who hammers through Guzan at the near post. The two contract rebels are looking set to dig Arsenal out of a hole here.
Adama Traore on for Middlesbrough and he is already making things happen down that right hand side, turning inside two Arsenal players, storming into the box but stumbling before the away side can clear.
Now Arsenal's turn to hold their heads in shame as a chance comes and goes. Sanchez picks out the run of Ozil but the onrushing Guzan snuffs out the chance as the Germany poked towards goal. Must admit, though the ex-Real Madrid playmaker pulled out of the tackle with the Boro 'keeper there.
Alvaro Negredo celebrates putting Middlesbrough on level terms.
Alexis Sanchez curls Arsenal into a first half lead.
Middlesbrough should be ahead now as Arsenal threaten to come apart at the seems. Downing is the provider again and when Gibson plays the ball across goal, Ayala is denied by a fine stop on the line by Cech.
Arsenal are all over the place at the back and they almost go behind when Stewart Downing takes the ball on the half-volley, but it flies over the bar. Middlesbrough back in this game in a big way now.
GOAL! Middlesbrough 1-1 Arsenal (Alvaro Negredo)
Middlesbrough were first out for the second half and they restart the game like a house on fire. Stewart Downing is allow to run deep inside the Arsenal half and when his cross evades Koscielny, Negredo is on hand to poke beyond Cech.
Players out and we're back underway in at the Riverside. The Premier League's lowest scoring club need a second half turnaround to boost their survival bid.
Half time: Middlesbrough 0-1 Arsenal
Boro plunged into further disarray as Arsenal take a lead into half-time. It's been an even game but both teams are separated by a moment of brilliance by Alexis Sanches, whose free-kick three minutes before the break has the visitors ahead. Middlesbrough have huffed and puffed, like they have for much of the campaign - but they have created little to trouble the back three deployed by Arsene Wenger.
GOAL! Middlesbrough 0-1 Arsenal (Alexis Sanchez)
Curiously named as one of the PFA Player of the Year nominees last week,the Chilean justifies that billing with his 19th goal of the season. He curls a free-kick over the Middlesbrough wall and with goalkeeper Brad Guzan rooted to the spot the ball nettles in the roof of the net.
Adam Clayton and Granit Xhaka battle for the ball.
Hard game to very overly excited about, as I feared before kick-off I must admit. Middlesbrough are dogged but lack any creative presence, while Arsenal are frustratingly lacking in cutting edge despite the millions of pounds worth of talent on offer.
Best opening of the night for Arsenal. Oxlade-Chamberlain scampers round the back and his clipped cross is headed back by Giroud towards Ramsey whose volley into the ground is cleared from Guzan's goal. Attacks have been rare from the visitors however.
Ball in the net for Middlesbrough but celebrations are cut short as De Roon is beyond the last Arsenal defender as he nodded beyond Petr Cech. A warning for Arsenal though, who have been typically lacklustre during the opening minutes.
Aaron Ramsey chases down a loose ball in the opening minutes.