With just six games to play, Barcelona have taken their total to 79 points, widening the gap to 11 points with second-placed Real Madrid, while Betis sit sixth and have 49 points.
And after Christensen opened the scoring in the 14th minute with a header after Rafinha’s cross pass, Barcelona’s task became easier as they sent off Betis defender Edgar Gonzalez, who replaced the injured Luiz Felipe in the 12th minute. , but left the game after 21 minutes for picking up a second yellow card.
The hosts capitalized on their chances in the second half, scoring twice in the space of three minutes through Lewandowski and Rafinha.
Barcelona widened the gap with an inverted goal from defender Guido Rodriguez.
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