His bunker shot by the green was his best on the final hole, leaving him two putts from 8 feet for the win. He looked tentative on the first putt, and it rolled 2 feet away, just enough to make him nervous.
That was more drama than he needed, though Fernandez-Castano still managed to win for the seventh time in his career.
Peter Uihlein made four birdies on the back nine for a 67 that gave him a share of fifth place with Thomas Bjorn, keeping both of them in the top 10 on the European Tour money list with three more events before the World Tour Championship in Dubai.
Henrik Stenson, who went into The Final Series with a healthy lead over Graeme McDowell, made five straight birdies on the back nine and shot 65, which extended his lead over McDowell, who shot 74. The prize money in these last four events is the largest on the European Tour, except for majors and WGCs.