RIO DE JANEIRO (AP) - 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.
The Spaniard declined to talk about his back, focusing instead on the victory.
''Clearly, it was important for me to get back and win after what happened in the final in Australia,'' Nadal said.
He said the heat, the court preparation and the quick balls used in the event made it difficult. He has complained about the fast balls all week.
Nadal has won three times in Brazil and hopes to return next year. He's also eyeing the 2016 Rio Olympics where he'd seek a second gold medal. He won gold in 2008 in Beijing.
''I leave with the sensation that Brazil is something special for me,'' he said.
Top-ranked Nadal used the Latin American clay-court swing to launch his comeback a year ago from a left knee injury. It went just fine with titles in the French and US Open.
He'll take the same approach this time, hoping injuries don't slow him heading to the French Open in three months.
Dolgopolov has lost all five matches against Nadal. At center court after the match he mentioned the near-civil war in Ukraine
''As you know there are some troubles in my country,'' he told thousands of fans, who applauded in support. ''Hopefully there's going to be peace in my country as I left it a few months ago.''
In the women's final at the combined ATP-WTA event, Kurumi Nara of Japan defeated top-seeded Klara Zakopalova of the Czech Republic 6-1, 4-6, 6-1 to win her first WTA singles title.
Nara, the 22-year-old Japanese, was seeded fifth in the tournament and is Japan's top-ranked woman. She prefers to play on hard courts but adapted to the heat and clay in Rio.
''I love Rio,'' Nara said, cracking a huge smile. ''I can't believe I won the tournament, but I am very happy.''
The victory is projected to push Nara into the top 50 - probably No. 48 - when the WTA publishes its rankings on Monday.
''I don't want to think too much about being No. 1 in Japan,'' Nara said. ''I just want to focus on my game - every game.''
Nara said Japanese players are getting better on clay because a new clay-court facility has been built in the country.
Maria Bueno, Brazil's greatest female player who won seven Grand Slam singles titles - her last in the US Open in 1966 - helped hand the winning trophy to Nara.
Zakopalova won two WTA titles 10 years ago, but has now lost 12 consecutive singles finals. In parts of the match she seemed unwell, probably bothered by the 32 Celsius (90 Fahrenheit) heat and intense humidity.
''I have an asthma problem so I couldn't breathe,'' Zakopalova said. ''But it's not an excuse. Well done to Kurumi. She deserved it. She played really well.''
Follow Stephen Wade on Twitter: http://twitter.com/StephenWadeAP