The victory Sunday comes a full 32 years after Fernandez's first win at this venue, and, at age 54, he can boast to be the oldest-ever winner of his home country's national championship.
Fellow countryman Romero, otherwise known as El Gato, did not make it easy for Fernandez, however.
Fernandez began the day with a comfortable five-shot lead, but lost that cushion quickly, entering the 15th hole on Sunday now one shot back of Romero. However, he summoned birdies at the 16th and 17th holes to regain his lead by a stroke.
Yet, the gritty Romero managed to conjure up a great birdie of his own at the 18th, and the match was sent into extra holes.
On the third hole of the playoff, Fernandez, faced with a birdie attempt of some 25 feet, calmly rolled in the putt for the victory.
'Today, at the beginning,' Fernandez said, 'I was making a bunch of bogeys when Eduardo was making birdies. But I never lost my calm. On the ninth hole, I hit my first really good drive of the day and recovered my confidence.'