Veteran striker Robert Lewandowski scored an 87th-minute winner for Barcelona against 10-man Atletico Madrid, sending his side seven points clear at the top of Spain’s La Liga.In a bad-tempered match, Barca were heading for a frustrating draw against opponents who played the whole of the second half with 10 men following Nico Gonzalez’s straight red card at the end of the first half.After Atletico defeated Barca over two legs in the Copa del Rey semi-final, this was the fourth meeting between the two rivals this season, with another two fixtures to follow inside the next two weeks in the quarter-finals of the Champions League.In an incident-filled encounter, the home side took the lead through a well-placed finish by Giuliano Simeone, the son of Atletico boss Diego, in the 39th minute.But their lead lasted just three minutes, with England forward Marcus Rashford scoring through the legs of goalkeeper Juan Musso before Gonzalez was shown a straight red for denying Lamine Yamal a goalscoring opportunity.Substitute Marc Bernal wasted a golden chance to put Barca ahead deep in first-half stoppage time before more controversy early in the second half.Barca’s Gerard Martin was shown a red card for an ugly challenge on Thiago Almada.But, much to Atletico’s anger, it was downgraded to a yellow after the referee was instructed to watch it again on the pitchside monitor.The visitors piled forward in search of a winner, Musso producing a fine save to deny former Manchester City forward Ferran Torres before Lewandowski, 37, scored the late winner.It came after Musso was unable to hold Joao Cancelo’s attempt, the ball hitting Lewandowski on the shoulder and flying into the net.“It’s not easy to play here because the atmosphere and emotions are very high here,” Barca boss Hansi Flick said after the game. “I am really happy with these three points.“We need this hunger. We have to win the games. We have eight games to play. We have to stay focused and always be ready.“We know that the Champions League is totally different and every player has more to give. Everyone wants to be in the semi-final. We have three more days to prepare, rest a little, and focus on the next game. These are the kind of games why I do this job.”With eight games to go, Barcelona have 76 points while nearest rivals Real Madrid, who suffered a surprise defeat at struggling Mallorca earlier on Saturday, have 69.The top two sides are due to meet on 10 May in Barcelona.Atletico stay fourth on 57 points and will travel to face Barcelona on Wednesday in the Champions League quarter-final first leg (20:00 BST kick-off).