The introduction of best-of-three set matches in the Davis Cup won't be enough to halt the drain of top talent from the 117-year-old world tennis tournament, Rafael Nadal said.

Five-time champion Novak Djokovic will be out to reassert his dominance on the hard courts of Indian Wells this week, seeking to shake off the slump that has dogged him into 2017.

Unseeded American Sam Querrey stunned second-seeded Rafael Nadal 6-3, 7-6 (7/3) on Saturday to win the ATP Mexico Open and end the Spaniard's run of perfection in Acapulco.

Andy Murray clinched his first title of 2017 and 45th of his career as he dominated Spain's Fernando Verdasco 6-3, 6-2 to win the Dubai Tennis Championships on Saturday.

Two-time champion Rafael Nadal rolled into the final of the ATP Mexico Open on Friday with a 6-1, 6-2 victory over Croatian Marin Cilic that extended the Spaniard's unbeaten record in Acapulco.

Rafael Nadal booked his semi-final spot at the Mexico Open by battling past Yoshihito Nishioka in straight sets, while top seed Novak Djokovic suffered another stunning exit in a shaky start to 2017.

Rafael Nadal bounced back from a break down in both sets to defeat Japan's Yoshihito Nishioka 7-6 (7/2), 6-3 and book a spot in the semi-finals of the ATP Mexico Open.

Former world number one Novak Djokovic was made to work hard before finishing strongly to defeat Martin Klizan in straight sets on his return to competition at the ATP Acapulco event on Tuesday.

Roger Federer showed few signs of rust after a month off following his Australian Open heroics in sending Benoit Paire packing at the Dubai Tennis Championships on Monday.

Austrian Dominic Thiem secured his eighth ATP title with a 7-5 6-4 win over Pablo Carreno Busta in the final of the Rio Open on Sunday.

Top-seeded Canadian Milos Raonic held off Juan Martin del Potro 6-3, 7-6 (8/6) on Saturday to book a title clash with Jack Sock at the ATP Delray Beach Open.

World number two Novak Djokovic will make his return from a shoulder injury at next week's ATP tournament in Acapulco, the Serb said on Friday.

Canadian top seed Milos Raonic advanced to the quarter-finals of the ATP Delray Beach Open on Wednesday by defeating Croatia's Borna Coric 6-3, 7-6 (7/2).

Former US Open champ Juan Martin Del Potro got his season off to another successful start at the Delray Beach Open, defeating Kevin Anderson in straight sets and overcoming an opening set tumble in the process.

Two days after playing the Doha final, Caroline Wozniacki plunged straight back to work on Monday at the Dubai Tennis Championships with a 6-2, 7-5 first-round defeat of Darya Kasatkina.

Japanese top seed Kei Nishikori lost a sixth successive final on Sunday when he was defeated by Ukraine's Alexandr Dolgopolov 7-6 (7/4), 6-4 in the Buenos Aires clay-court title match.

Top seed Kei Nishikori survived a tough slog against unheralded opponent Carlos Berlocq before winning his semi-final match at the Argentina Open on Saturday.

Pat Rafter steps down as Tennis Australia's head of performance, ending his rocky relationship with the country's two polarising stars Nick Kyrgios and Bernard Tomic.

Novak Djokovic and Nick Kyrgios hope the Davis Cup heals the wounds of their painful Australian Open exits this weekend when they will be the only two men in the top 15 taking part.

Maria Sharapova said Wednesday she refused to feel sorry for herself during her doping ban, occupying her time by studying at Harvard, writing a book and even learning how to box.