Arsenal edged to the top of the Premier League, but there was little else to cheer for Arsene Wenger on his 67th birthday as his team played out a goalless draw against Middlesbrough guided by Mourinho’s protege Aitor Karanka at Emirates Stadium.
Winless since beating north-east rivals Sunderland in August, Boro could feel aggrieved not lead at the break after Petr Cech pulled off impressive saves to deny Adama Traore and Gaston Ramirez either side of the latter player clattering the angle of post and crossbar with a brilliant free-kick.
So fluent in recent weeks, Arsenal were fitful in attack as Victor Valdes’ best save in the Boro goal came as he athletically thwarted Alexis Sanchez from distance.
Theo Walcott scored for the seventh time in six matches in the 6-0 Champions League demolition of Ludogorets on Wednesday, but his efforts here fell well short of those standards and midweek hat-trick hero Mesut Ozil had a goal correctly ruled out for offside in stoppage time.
Aitor Karanka’s fourth-bottom side once again proved a tough nut to crack on their travels – six of their seven points this season have now come away from the Riverside Stadium.
Arsenal began confidently in pursuit of an eighth consecutive win in all competitions, pushing Middlesbrough deep into their own territory as Ozil lifted a free-kick over and Mohamed Elneny – into a midfield missing Santi Cazorla and Granit Xhaka through injury and suspension respectively – fired wide.
Ozil had a penalty appeal rejected after a coming together with Marten de Roon before a pair of scares for the hosts.
Alvaro Negredo won a 19th-minute flick-on from Daniel Ayala’s raking pass and Traore darted in behind Laurent Koscielny but Cech stood firm.
The Arsenal goalkeeper was helpless a minute later when Ramirez came agonisingly close with his vicious, swerving free-kick, while opposite number Valdes was called upon to keep out an Alexis Sanchez set-piece.
In the 33rd-minute, a clear chance again fell Middlesbrough’s way as Koscielny blocked Negredo’s header from Traore’s cross and Cech was out superbly to deny Ramirez from point-blank range on the rebound.
Wenger’s men resumed with renewed purpose and Valdes should have been punished when he fumbled in the area and Koscielny could not convert Sanchez hook across goal.
The 34-year-old then showed some of the form that helped to establish him as Barcelona’s long-time number one – sprawling full-length to keep out a dipping low Sanchez drive.
But this wave of pressure did not put Boro into survival mode, as Hector Bellerin made sprawling challenge to deny De Roon and Cech tipped wide at full stretch after Traore’s electric pace cut the Arsenal defence to ribbons before the hour.
An untimely error from the impressive Ramirez almost let Walcott open the scoring but the England man shot too close to Valdes.
The former Spain international remained relatively unthreatened during the closing stages, while Koscielny needed a last-ditch tackle to prevent Negredo stealing the points.
Arsenal briefly thought Ozil had pilfered a victory, but their stay at the summit will be short-lived if Liverpool beat West Brom by two goals in Saturday’s late kick-off.