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Grand Prix de Wallonie: Serrano outsprints Teuns for victory
De Buyst finishes third, Van der Poel fourth at Citadelle de Namur -
Van der Poel lays down Worlds marker with GP de Wallonie win
Dutchman holds off Girmay, Serrano takes third -
Laporte wins Grand Prix de Wallonie
Cofidis rider tops Barguil, Van der Sande on the Citadel of Namur
