Real Sociedad showed off their attacking prowess ahead of Tuesday's Champions League match against Manchester United when the Basque club won 5-0 at home to 10-man Osasuna to climb to seventh in La Liga on Saturday.
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Defenders Ion Ansotegi and Inigo Martinez struck with headers either side of halftime at the Anoeta before Osasuna centre back Jordan Loties was shown a straight red card for tripping Carlos Vela when he was through on goal.
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In-form forward Antoine Griezmann nodded a third in the 56th minute, Gonzalo Castro finished off a sweeping break in the 82nd and substitute Haris Seferovic helped himself to a goal two minutes from time as the visitors crumbled.
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San Sebastian-based Sociedad have 17 points from 12 matches, two behind sixth-placed Getafe who host Valencia on Sunday, while Pamplona club Osasuna are mired down in 16th, a point above the relegation places.
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Real Madrid can close to within two points of second- placed city rivals Atletico with a win at another Madrid club, struggling Rayo Vallecano, later on Saturday.