Novak Djokovic rallied from a break down in the first set to win his fourth Dubai Championships title in five years Saturday, downing third-seeded Tomas Berdych 7-5, 6-3.The top-ranked Djokovic extended his unbeaten streak this year to 13 matches, which included his third straight Australian Open title.Djokovic has won 13 of their last 14 meetings en route to his 36th career title.“It was never going to be an easy final for either one of us,” Djokovic said. “Tomas is a fantastic player. He has been around the tour and was a Grand Slam finalist [at Wimbledon]. … I’m just fortunate to go through.”No. 15 Isner upsetEdouard Roger-Vasselin upset top-seeded John Isner 6-4, 4-6, 6-4 in the semifinals of the Delray Beach International Tennis Championships.The 15th-ranked Isner could never find his form against Roger-Vasselin, who was playing in his first career ATP World Tour semifinal. Roger-Vasselin was 0-5 in career quarterfinals. His father, Christophe, was a French Open semifinalist in 1983 and ranked as high as 39th.Roger-Vasselin will play 109th-ranked qualifier Ernests Gulbis of Latvia in the final. Gulbis upset second-seeded Tommy Haas of Germany 6-3, 4-6, 7-6 (2) to reach the final.Nadal beats FerrerNo. 2 seed Rafael Nadal made short work of top seed and three-time defending champion David Ferrer in the finals of the Mexican Open in Acapulco. Nadal breezed to a 6-0, 6-1 victory to hand Ferrer his first loss at the tournament in 20 matches.Briefly • Malaysian Open: Bethanie Mattek-Sands of the United States defeated third-seeded Anastasia Pavlyuchenkova of Russia 6-4, 6-1 in Kuala Lumpur to reach her first WTA singles final in two years. Mattek-Sands will meet Karolina Pliskova of the Czech Republic in today’s final. • Brazil Tennis Cup: Monica Niculescu of Romania defeated Olga Puchkova of Russia 6-2, 4-6, 6-4 in the final in Florianopolis to win her first WTA title.