* Manchester United moved into fifth place by beating managerless Middlesbrough 3-1
* Marouane Fellaini headed them into the lead in the 30th minute
* Jesse Lingard drove in the second just after the hour mark
* The home side ensured a frantic finish with Rudy Gestede's goal
* Boro goalkeeper Victor Valdes's error gave Antonio Valencia a third in added time
* Middlesbrough at Swansea next; United at home to West Bromwich Albion
March 19 (Reuters)- Manchester United moved into fifth place in the Premier League on Sunday with a 3-1 victory away to struggling Middlesbrough, who sacked manager Aitor Karanka on Thursday.
Jose Mourinho had said his team would "probably lose" because their current fixture congestion would lead to fatigue, but despite missing Zlatan Ibrahimovic, Paul Pogba, Wayne Rooney and Ander Herrera, they counter-attacked well.
Belgium international Marouane Fellaini headed them in front after almost half an hour's play for his first league goal of the season and Jesse Lingard scored the second just after the hour mark from 20 metres.
Boro' substitute Rudy Gestede pulled a goal back with 12 minutes left, but in added time goalkeeper Victor Valdes slipped, allowing Antonio Valencia to score a third United goal.
Middlesbrough, by far the lowest scoring team in the league, have still not won a league game in 2017. (Reporting by Steve Tongue; Editing by Toby Davis)