AFC Ajax and PSV Eindhoven kept their Eredivisie title aspirations alive with Sunday triumphs that pulled them within four and five points respectively of leaders FC Twente. Ajax were 3-0 winners at home to FC Groningen, Jan Vertonghen scoring either side of a Siem de Jong effort, while Otman Bakkal also claimed a double as PSV eased to a 4-2 victory at VVV Venlo.