Rafael Nadal returned from a troublesome back injury to win the Rio Open on Sunday, defeating Alexandr Dolgopolov of Ukraine 6-3, 7-6 (3). Nadal’s victory comes four weeks after losing the Australian Open final to underdog Stanislas Wawrinka after tweaking his back while warming up. Nadal, who had to fend off two match points in the semifinal against Pablo Andujar, looked more comfortable in the final and improved his record on clay to 298 wins and 21 losses, the best in the Open Era. Nadal has won three times in Brazil and hopes to return next year.