The defending champions toiled against their lowly opponents and looked set to drop two vital points when Excelsior´s Geert Den Ouden cancelled out Balazs Dzsudzsak´s opener with nine minutes to go.
But Koevermans, who had come on as a 61st-minute substitute for Jason Culina, grabbed the winner with time almost up to move PSV six points clear of the chasing pack.
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