Japan's Kei Nishikori made a stunning start to what will surely be the first of many appearances at the ATP World Tour Finals with a 6-4, 6-4 win over home favourite Andy Murray on Sunday.
Images from Day 3 of the US Open, at Flushing Meadows, New York.
After shaking hands with the opponents, the 24-year-old Zverev, ranked third in singles, approached the umpire's chair and hit it repeatedly before heading towards his courtside seat, upset over a line call during the match earlier.
A round-up of all the tennis action from around the globe.
Stan Wawrinka reached his second final of the season as Nick Kyrgios retired injured from their semi-final at the ATP Dubai Championships on Friday. The Australian quit due to back pain while trailing 6-4, 3-0, having had on-court treatment after the seventh game of the opening set. Wawrinka now moves into position for a possible second trophy of the season after winning in Chennai to start the year. The French Open champion will face either sixth seed Feliciano Lopez, who advanced in the quarter-finals when Novak Djokovic was unable to continue due to an eye infections or former Australian Open finalist Marcos Baghdatis. Wawrinka, ranked fourth, carries an enviable record into the Saturday title match at the Aviation Club, having won his last eight finals.
Melbourne man McNamara won five singles titles and 19 in doubles and teamed up with compatriot Paul McNamee to win the Australian Open doubles in 1979 and Wimbledon twice in 1980 and 1982.
Zverev has not lost to Wawrinka in two previous meetings but is not taking the 2014 Melbourne Park champion lightly.
Novak Djokovic reached the Paris Masters final for the sixth time
Rohan Bopanna and Aisam-ul-Haq Qureshi on Saturday missed out on their second ATP Tour title of the season as they lost the final of the Nice event in France despite a rollicking start. Bopanna and Qureshi had grabbed a one-set lead in quick time but could not survive the counter-attack of Marcelo Melo and Bruno Soares to lose 6-1, 3-6, 5-10 in one hour and 13 minutes.
That is Murray's 46th ATP title.
The 18-year-old Rune broke world number three Zverev four times in a flawless performance for his first win over a player in the ATP top-10
Paire won his first ATP Tour title on the clay at Bastad in July and will go in search of his second against French Open champion Wawrinka, who served strongly in taking out Gilles Muller of Luxembourg.
Rafael Nadal has withdrawn from next week's season-opening exhibition event in Abu Dhabi due to ongoing fitness problems, the world number one said.
To mark 20 years of Ivanisevic's win, the ATP tweeted, his road to victory.
Rafael Nadal and the world's best men's tennis players found themselves having to endure a 4 a.m. meeting in the freezing cold after fire alarms forced them to evacuate their central London hotel on Tuesday.
Aryna Sabalenka rose above geopolitical tumult to become the first player to claim a Grand Slam title as a neutral at the Australian Open.
World tennis No 4 Rafael Nadal has pulled out of the Paris Masters and the ATP World Tour finals in London as he is still recovering from his left knee injury, the ATP said on Thursday.
The world number one was virtually guaranteed a semi-final berth before walking on court at the O2 Arena, but made doubly sure by cruising past Tomas Berdych in little more than an hour.
US Open champion Marin Cilic made a shock first-round exit from the Shanghai Masters on Monday after losing 7-5, 2-6, 7-6(2) to fellow Croatian Ivo Karlovic.
Nick Kyrgios was given a warning for taking too long to return Tsitsipas's serve
From the heady heights of contesting his first ATP final, Nicolas Mahut will have to come back down to earth quickly because he has to try and qualify for Wimbledon.
Defeat by Alexander Zverev at the ATP Finals on Saturday left Roger Federer stuck on 99 career titles, but despite missing out on his century the Swiss said he was happy with his season.
The claycourt specialist won 6-4 6-4 as he followed up last week's win in Vina del Mar, Chile with another title, his first on home soil.
The fourth seeded Indian pair of Harsh Mankad and Ashutosh Singh lost to the top seeded Australian pair of Adam Feeney and Robert Smeets 3-6, 7-6(5), 6-10, in the final of the Euro 30,000 ATP Challenger grasscourt tournament in Manchester.
Gilles Simon scored a 6-4, 6-4 victory over defending champion Dmitry Tursunov at the Indianapolis Championships on Sunday.
For 15 minutes Novak Djokovic appeared to have a fight on his hands at the ATP World Tour Finals on Wednesday, then the Serb dialled up his A game and tore Stanislas Wawrinka to pieces.
The Indo-Romanian pair won 6-3, 6-7(6), 10-7 over the second seeded Polish-Serbian combination win in the super tie-breaker in a battle that lasted just over one hour.
The Indian pair of Mahesh Bhupathi and Rohan Bopanna stood just win away from for its second ATP men's doubles title together this season after advancing to the BNP Paribas Masters final in Paris.
The second seeds cruised through the second set after a tense opener
Roger Federer moved to within one win of his 1,000 career victory when he crushed Bulgaria's Grigor Dimitrov on Saturday to reach the final of the Brisbane International.
'It's pretty amazing to get the call from the Spanish king'
India's Rohan Bopanna and Ramkumar Ramanathan registered a resounding straight-set win to cruise into the doubles semi-finals but it was the end of the road for compatriot Sania Mirza and her Ukrainian partner Nadiia Kichenok, in Adelaide, on Friday.
Somdev Devvarman's giant-killing run ended with a straight-set loss to fourth seeded American Robert Kendrick in the final of the ATP Challenger Series' hard-court tournament in Nashville, US. The Indian Davis Cupper, who had beaten the second and third seeds in the run-up to the final, lost 3-6, 5-7.
Zverev had surgery on torn ligaments in his right ankle this month after he was forced to retire from his French Open semi-final against Rafael Nadal.
World number one Novak Djokovic continued his dominance of Kei Nishikori with a 6-3, 7-5 victory in the final of the Rogers Cup in Toronto on Sunday.
Nagal's court coverage and solid defence in long drawn points was the highlight of his win.
'Generally, I'm happy outside the court, happy on the court, happy in life. Then I think you play your best.'
The Indo-Pakistan duo beat top seeds Harel Levy of Israel and Lars Burgsmuller of Germany in the semi-finals.
Norrie's semi-final opponent will be another American, fourth-seeded Tommy Paul, who crushed Stefan Kozlov 6-3, 6-1 in an all-US matchup.
