Federer called the trainer to the court during the third set against Sandgren and then took a lengthy medical timeout
World No 1 and top seed Serena Williams was knocked out of the Australian Open by Serbian Ana Ivanovic on Sunday.
Nadal meets the 'new Nick' Kyrgios in fourth-round blockbuster
South Korean tennis player Hyeon Chung will be a star attraction at the second edition of Tata Open Maharashtra beginning in December.
Russia's Ekaterina Makarova etched her name into Australian Open folklore on Monday by stunning Serena Williams 6-2 6-3 in their fourth-round match to end the American's aura of invincibility at Melbourne Park.
Images from day three of the Australian Open 2012 tennis tournament in Melbourne, on Wednesday.
Matching Roger Federer's record Grand Slam haul will act as huge motivation for Rafael Nadal
A proposal to boycott the Australian Open by male players at the weekend over prize money was supported by the majority of ATP players but not followed through as it would have been unfair on tournament organisers, Ukraine's Sergiy Stakhovsky said.
A ruthless Andy Murray powered his way to a 6-1, 6-3 win over injury-hampered Alexandr Dolgopolov to win the Brisbane International and take a timely shot of confidence ahead of the Australian Open.
Naomi Osaka settled her nerves and stepped up her preparations for the Australian Open by beating Alize Cornet 6-2, 6-2 to reach the last 16 of the Gippsland Trophy warm-up tournament in Melbourne on Tuesday.
Britain's Johanna Konta has learned much from matches against Grand Slam champions and former world number ones over the last 18 months but on Wednesday her education will be complete when she faces Serena Williams in the Australian Open quarter-finals.
Stan Wawrinka was not fully convincing in his four-set victory against Serbian Viktor Troicki but the fourth seed refused to fuss over the nature of his win after securing his place in the fourth round of the Australian Open on Friday.
Angelique Kerber ended Johanna Konta's fairytale run at the Australian Open with a 7-5, 6-2 victory on Thursday to earn a place in her first grand slam final.
Tsitsipas will play 22nd-seeded Spaniard Roberto Bautista Agut for a place in the semi-finals.
Australian great Ken Rosewall will bestow the French Open trophy on the men's singles champion next month and sees only one grateful player ready to claim it -- Rafael Nadal.
IMAGES from the Australian Open final played on Sunday
Leander Paes of India and his Czech partner Radek Stepanek stunned American pair of Bob and Mike Bryan to clinch the Australian Open men's doubles trophy.
World No. 1 Novak Djokovic fought off what appeared to be breathing problems and fatigue to advance to the final of the Australian Open following an epic five-set semi-final victory over Britain's Andy Murray.
Summary of sports events and persons who made news on Sunday
Maria Sharapova stood, looked at the players' box, slammed both of her fists down in celebration and let out an almighty roar of "Come on!"
Fourth seed Maria Sharapova overcame a second set rally by Petra Kvitova to advance to her third Australian Open final with a 6-2, 3-6, 6-4 victory on Thursday. She will now meet third seed Victoria Azarenka in the final on Saturday after the Belarusian earlier beat 2011 champion Kim Clijsters 6-4, 1-6, 6-3.
Russia's Maria Sharapova booked her spot in the last four of the Australian Open on Wednesday with a surprisingly simple 6-2, 6-3 win over compatriot Ekaterina Makarova. She will face Czech Petra Kvitova.
Serena Williams has played two matches in five months and comes into the Australian Open still feeling the effects of a twisted ankle but the American has no doubts she can claim a 14th Grand Slam single title.
Ivan Lendl could be the missing piece to Andy Murray's Grand Slam puzzle, says the Briton's former-coach Darren Cahill, who helped pick his new mentor.
Three-times Grand Slam winner Murray has struggled to regain form since undergoing hip surgery last January and was knocked out in the first round of the Australian Open on Monday having said the tournament could be his last as a professional.
Images from Day 6 of the Australian Open in Melbourne, on Saturday.
World number two Andy Murray has repeated, emphatically, that he will abandon the pursuit of his first Australian Open title if his wife goes into labour early.
Sofia Kenin said that the experience at Roland Garros changed her career trajectory.
The 28-year-old said beating American great Williams was the finest win of her career, outstripping her upset of world number one Ash Barty at last year's US Open.
Robin Soderling and Andy Murray served up reminders that there are more than two contenders for the men's title at the Australian Open with dominant third-round victories on Saturday.
The Australian Open draw has opened up a potential can of worms for security organisers at Melbourne Park, with rival Serb and Croatian supporters to be thrown into close proximity for Novak Djokovic's second round match against Croatia's Ivan Dodig.
Two surprise Grand Slam final appearances have given Vera Zvonareva the world number two ranking and the confidence to go one better at the Australian Open, but remarkably, the Russian remains saddled with the 'dark horse' tag.
Images from Day 1 at the Australian Open.
Malaika Arora Khan leads 1,200 people to a record.
It took nearly five hours of gruelling tennis for Rafael Nadal to fend off Grigor Dimitrov and book a dream Australian Open final against Roger Federer but before Melbourne Park the Spaniard endured a season of heartache and doubt.
Rafael Nadal's path to his Australian Open semi-final against Grigor Dimitrov on Friday has taught the 30-year-old Spaniard one thing -- he's still got it.
Johanna Konta earned the chance to fulfill a childhood dream when she advanced to an Australian Open quarter-final contest against Serena Williams by dismantling Ekaterina Makarova 6-1, 6-4 on Monday.
Rafael Nadal held off a fierce challenge from one of the hottest prospects in the game when he outlasted German teenager Alexander Zverev 4-6, 6-3, 6-7(5), 6-3, 6-2 to reach the last 16 of the Australian Open.
A deflated Novak Djokovic blamed a bad day at the office for his stunning second-round elimination by Uzbek wildcard Denis Istomin which condemned the Serb to his earliest grand slam exit in nearly a decade.
Roger Federer dug himself out of a late slump to fend off American qualifier Noah Rubin 7-5, 6-3, 7-6(3) on Wednesday and draw vital confidence for a tough third round clash against 10th seed Tomas Berdych at the Australian Open.