Rafael Nadal bows out early as del Potro rolls into US Open final

Rafael Nadal bows out early as del Potro rolls into US Open final

“Ole’’ — the Spanish Warrior quit. Nine years later, Argentina’s Juan Martin del Potro is back in the U.S. Open final, unleashing the sport’s best forehand on defending champion and top-seeded Rafael Nadal of Spain, whose right knee acted up, forcing him…