Castro was tied with Sydney FC's Ninkovic on 25 points going into tonight's game against  Krishna's Wellington Phoenix.

But a goal by Castro in the 5-0 rout of Phoenix at HBF Park saw the Spaniard pick up  Man of the Match honours and the three points to grab the award.

The 36-year-old is the first A-League player to win the medal twice.

A winner of the  2015–16 Johnny Warren Medal, Castro scored seven goals this season and signed a two-year contract extension with Glory earlier this week after another impressive campaign pulling the strings for the attack.

Isaias (Adelaide United) and Kosta Barbarouses (Melbourne Victory) rounded out the top five. Medal points are awarded 3,2,1 for matchday performances.

Krishna, who was sitting on 24 points, was rested in the first half of tonight's match and had little opportunity to close the gap.

But the Fijian international picked up the coveted Golden Boot award with 18 goals, beating out Sydney FC's Adam Le Fondre who finished his first campaign in the A-League with 16 to his name.