The Spaniard's exit follows Sergio Garcia's release from the circuit, which is attempting a $300m rescue after Saudi Arabia pulled funding.
The 24-year-old shot a final-round 64 to win by three strokes, freeing his promising PGA Tour career from a mandatory two-year hiatus.
The world number four criticises tour organisers for being "very vague" about safety plans after a hotel he visited last year was hit by a missile.
