Casares - England's Ross Fisher beat American Anthony Kim four and three to claim the Volvo World Match Play Championship at the Finca Cortesin Golf Club here on Sunday.
A birdie on the first hole of the 36-hole final gave the 28-year-old an early lead and he was never behind, eventually securing victory when both players recorded pars on the par-four 33rd.
The victory earned Fisher the 750,000-euro top prize, which takes him from seventh to fourth in The Race to Dubai European Tour money list.
Leading by one hole after the morning session, Fisher went three up after winning the 22nd and 23rd holes, first with a 35-foot eagle putt and then a birdie after Kim drove into trouble.
Kim - one of the stars of the United States Ryder Cup victory last year - responded on the 24th to reduce the deficit but Fisher kicked again on the back nine, restoring his three-hole lead when Kim bogeyed the 28th and going four up with four to play thanks to a birdie at the par-four 32nd.
Fisher, who led in the British Open on the final day only to implode, went into the afternoon with a one-hole lead, having missed a chance to extend his advantage by three-putting on the 18th after Kim could only make par.
The Wentworth golfer took the lead on four separate occasions but was never able to pull away, with Kim levelling the match on the seventh, ninth and 13th holes before bogeying the 464-yard 16th to hand his opponent the initiative.
Earlier, Australia's Robert Allenby defeated Argentina's Masters champion Angel Cabrera in the 18-hole third-place play-off match.
Allenby, who was defeated by Kim in Saturday's semi-final, holed in one with a 230-yard five wood on the sixth hole but had to birdie the 18th to send the match to a sudden-death play-off.
The Australian prevailed on the first extra hole after sinking an 18-foot eagle putt off the back of the green, giving him third place and a cheque for 250,000 euros.