Rafael Nadal, right, beat David Goffin 6-4, 7-6 to win the Mubadala World Tennis Championship last year. Nezar Balout / AFP
Rafael Nadal, right, beat David Goffin 6-4, 7-6 to win the Mubadala World Tennis Championship last year. Nezar Balout / AFP

Rafael Nadal's return to Abu Dhabi to prepare for 2018 the 'perfect bookend' for a successful year