article_snippet: Barcelona could move four points clear of Carlo Ancelotti's side at the top of La LIga
article_snippet: The two giants approach a title-defining match in contrasting form with Barcelona having won 17 of The two giants last 18 matches in all compeitions - the latest a 1-0 victory against Premier League champions Manchester City on Wednesday night.
highlights_snippet: Barcelona take on Real Madrid at the Nou Camp on Sunday night .
  
highlights_snippet: Barcelona can extend their lead at the top of La Liga to four points with a win .
  