Having annoyed Nadal with an underarm serve at Acapulco, Nick Kyrgios doubled down with the tactic to win two points against hapless Serb Dusan Lajovic at the Miami Open and fire up a timeworn debate between modern fans and purists.

A summary of sports events and persons who made news on Monday

Summary of sports events and persons who made news on Monday

Nick Kyrgios needs to improve his fitness to have a chance of winning Grand Slams, former world number one Jim Courier said on Wednesday.

Nick Kyrgios saved his best performance of a brilliant week for last as the Australian stunned second seed Alexander Zverev 6-3, 6-4 to win the Acapulco International in Mexico on Saturday for his fifth career ATP title.

Roger Federer claimed the 100th ATP title of his career by beating 20-year-old Greek Stefanos Tsitsipas 6-4, 6-4 in the final of the Dubai Duty Free Tennis Championships on Saturday.

After a brief interruption when the players were locked at 5-5 in the opening set, Federer saved two set points in the tiebreak and held firm to gain the upper hand in the contest.

The Australian fell to the floor in celebration after clinching the victory, before sticking a finger behind his ear and asking the raucous crowd to cheer louder.

Roger Federer was made to work hard by Fernando Verdasco before beating the Spanish veteran 6-3, 3-6, 6-3 on Wednesday to reach the quarter-finals of the Dubai Duty Free Tennis Championships.

Roger Federer began his latest quest for a 100th ATP title with a battling 6-4, 3-6, 6-1 win over Philipp Kohlschreiber in the first round of the Dubai Duty Free Tennis Championships on Monday.

Summary of sports events and persons who made news on Saturday

Unseeded Australian Daria Gavrilova upset fifth seed Petra Kvitova, of the Czech Republic, 6-2, 6-1 in the first round of the China Open on Saturday as Serbia's Aleksandra Krunic showed stunning powers of recovery to pull off her own shock win over sixth seed Elina Svitolina.

Japan's Kei Nishikori, who will arrive at Roland Garros without an ATP title for more than two years and desperate to prove that his career has not already peaked.

Karolina Pliskova lost her cool over a line call and bashed a hole into the umpire's chair with her racket after suffering a 3-6, 6-3, 7-5 defeat by Maria Sakkari in the Italian Open second round on Wednesday.

The former Miss Universe wrote a heartfelt note cherishing the good times.

US Open champion Stephens again ended former world number one Victoria Azarenka's hopes of a fairytale comeback by beating her 3-6, 6-2, 6-1 in an afternoon encounter, while French Open champion Ostapenko beat unseeded American Danielle Collins in the nightcap, staving off a set point en route to a 7-6(1), 6-3 triumph.

Juan Martin del Potro could barely believe he had finally won a Masters 1000 series title at the 51st attempt at Indian Wells on Sunday but is determined to keep the trophies coming in his late career renaissance.

Juan Martin del Potro saved three match points in a thrilling final at the BNP Paribas Open on Sunday before handing world number one Roger Federer his first loss of the year and claiming his maiden Masters 1000 title.

Battle-scarred Argentine Juan Martin del Potro clinched his 21st career title with a 6-4, 6-4 win over Kevin Anderson in the Mexican Open final in Acapulco on Sunday.

Rafael Nadal has pulled out of the Indian Wells and Miami Open tournaments after aggravating the leg injury that forced him out of the Australian Open in January, the Spanish world number two said on Friday.

Top seed Rafael Nadal pulled out of this week's Mexican Open in Acapulco after aggravating the leg injury that forced him out of the Australian Open last month.

A summary of sports events and sports persons, who made news on Tuesday

A ruthless Sorana Cirstea took full advantage of Karolina Pliskova's patchy form at the China Open on Thursday, reaching the quarter-finals as she consigned the recently dethroned world number one to a 6-1, 7-5 defeat.

Former World No. 1 and Wimbledon champion has emerged as the surprised as the surprise candidate to take over Novak Djokovic's coach, The Daily Telegraph reported.

A winner of 12 Grand Slam titles, the Serb has suffered a noticeable dip in form since winning his maiden French Open last June, relinquishing top spot in the ATP rankings to Briton Andy Murray five months later.

A floundering Novak Djokovic should seek advice from evergreen Swiss maestro Roger Federer in order to rediscover his vintage self, the Serb's former Davis Cup coach Bogdan Obradovic said.

The Indian trio of Zoravar Singh Sandhu, Kynan Chenai and Birendeep Sodhi could not make it through to the six-man final round of the competition, failing in the qualification round.

Elena Vesnina denied Venus Williams another comeback win, while Kristina Mladenovic roared back from a set and a break down to beat Caroline Wozniacki on Thursday to reach the semi-finals of the BNP Paribas Open at Indian Wells.

Nick Kyrgios ended Novak Djokovic's 19-match winning run at Indian Wells by beating the Serb 6-4, 7-6(3) to reach the BNP Paribas Open quarter-finals in Indian Wells on Wednesday, while Roger Federer also advanced with a straight sets win over Rafael Nadal.

Stanislas Wawrinka breezed into the fourth round of the BNP Paribas Open on Monday and saw another seed removed from his path to the final when lucky loser Yoshihito Nishioka of Japan turned his match against Tomas Berdych upside down.

Bopanna is back with his regular partner Pablo Cuevas for this tournament and they face Serbian team of Djokovic and Victor Troicki.

American Sam Querrey claimed the biggest title of his career with an emphatic 6-3, 7-6(3) upset victory over second seed Rafael Nadal in the final of the Mexican Open.

Rafael Nadal reached the final of the Mexican Open on Friday night in Acapulco, Mexico, with a 6-1, 6-2 victory over Marin Cilic of Croatia.

Australian Nick Kyrgios served like a demon to bounce Serbia's world number two Novak Djokovic out of the quarter-finals of the Acapulco International with a 7-6(9), 7-5 victory on Friday.

Fourteen-time Grand Slam champion Rafael Nadal has entered the quarter-finals of the ATP Acapulco tournament with a comprehensive straight-sets victory over Italy's Paolo Lorenzi.

Here are Aseem Chhabra's picks -- 'films that mattered to me, entertained me and will stay with me through the year.'

Only three active players -- Novak Djokovic (1080), Nadal (804) and Roger Federer (742) -- have more singles victories than him in world tennis. All this means that David Ferrer has won the most number of matches on the ATP Tour without a Grand Slam title.

Austrian Dominic Thiem became the first player to capture titles on three different surfaces this year when he finished off Philipp Kohlschreiber to win the Mercedes Cup in Stuttgart on Monday.

American seventh seed Sloane Stephens captured her third title of 2016 by defeating Russian qualifier Elena Vesnina 7-6(4), 6-2 in the final of the Volvo Car Open clay court event in South Carolina on Sunday.

Veteran Indian tennis player Leander Paes and his French doubles partner Jeremy Chardy crashed out of the Mexico Open after losing in straight sets in the first round in Acapulco on Wednesday.