Spain\'s Gonzalo Fernandez-Castano won the $6 million weather-affected Singapore Open at the second extra hole of a sudden playoff on Monday from Filipino Juvic Pagunsan.Fernandez-Castano rolled in a nine foot birdie putt at the par-five 18th to claim the $1 million first prize after the playoff at the Sentosa Golf Club was twice delayed by heavy rainstorms on Sunday.