Jan 21 (Reuters) - Spain's Jon Rahm and American Andrew Landry were headed for a playoff at the Career Builder Challenge after Landry made a birdie putt at the last hole on Sunday. Both finished regulation at 22-under 266 at the Stadium Course at La Quinta in southern California. (Reporting by Gene Cherry in Salvo, North Carolina; Editing by Greg Stutchbury).readfullarticle