Tomic has withdrawn from his last four tournaments, pushing his ranking to depths that will require him to battle on lower-tier tours or beg for wildcards from tournament organisers next year.
Serbia's Aleksandra Krunic added her name to a list of anonymous figures to emerge from the Flushing Meadows shadows and step into the US Open spotlight with a shock 6-4, 6-4 win over Wimbledon champion Petra Kvitova on Saturday.
Kevin Anderson spoiled the American party at the US Open when the big-serving South African beat local favourite Sam Querrey 7-6(5), 6-7(9), 6-3, 7-6(7) to reach his first Grand Slam semi-final on Tuesday.
One year after shaking off a crippling foot injury to claim a stunning US Open victory, Sloane Stephens said her follow-up season felt just as good as the American prepares to play in next week's WTA Finals for the first time.
The 17th seed has been in no-nonsense mood so far in Melbourne, moving through the rounds with the minimum of fanfare, but faces her biggest test against the German.
The 27-year-old Romanian beat Sloane Stephens at Roland Garros to win her maiden Grand Slam title in June and will have spent 40 weeks at the top of the rankings by the end of the season.
IMAGES from Day 3 of the US Open in New York on Wednesday.
'For me, I don't feel sad because I wouldn't even know what I'm expected to feel'
Novak Djokovic heads into his US Open final clash with Juan Martin del Potro on Sunday knowing he faces a challenge - a very big challenge indeed.
'Almost three hours. It's midnight now. Credit to John for putting up a great battle'
The actress turns 37 today, April 16.
'He's done a lot for the African American community, and it's cost him a lot. It's sad' 'To be compared to Ali or Jordan, I really have no words'
Nadal and Williams headline party for all ages at US Open
Serena, a six-times champion in New York who is seeded 17th, will start her campaign against Polish world number 60 Magda Linette and could face Venus in the third round before a possible fourth-round showdown with Romanian top seed Halep.
France's Alize Cornet thrashed an error-prone Eugenie Bouchard 6-1, 6-2 to win the Hobart International title on Saturday.
A look at the top men's contenders at the 2020 French Open.
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.
Former world number one Maria Sharapova avenged her US Open loss to Anastasija Sevastova with a 7-6(3), 5-7, 7-6(7) victory over the Latvian in the China Open first round on Saturday.
Daniil Medvedev continued his march towards a first Grand Slam title on Wednesday, powering into the US Open semi-finals with a clinical 7-6(6), 6-3, 7-6(5) victory over childhood friend Andrey Rublev.
World number one Novak Djokovic was sensationally disqualified in the US Open fourth round on Sunday after striking a line judge with a ball following a point during the first set of his match against Spain's Pablo Carreno Busta.
John Tomic, father and coach of Australian tennis player Bernard Tomic, will be barred from the Australian Open as he continues his suspension from the ATP tour for assaulting his son's former training partner.
Chasing a sixth US Open title, Federer needed just one hour and 46 minutes under a closed roof at Arthur Ashe Stadium to put away the 31st seed Lopez, leaving plenty in the tank after being forced to go the distance in his opening two matches.
"Specifically, with Bouchard we are comfortable with our decision of putting her on Ashe, there are a lot of matches to schedule today, things could have gone many different ways," USTA spokesman Chris Widmaier told Reuters.
Osaka has had to mix things up during a grinding progression to the last eight at Melbourne Park
Britain's world number two Andy Murray pulled out of the US Open on Saturday, citing a hip injury.
American great John McEnroe expects Roger Federer's sensational comeback season to continue in New York when the US Open kicks off on Monday.
Naomi Osaka is no longer a shy, introvert youngster and the newest Grand Slam winner in women's tennis says she owes her maturity to last year's US Open triumph.
Patrick Mouratoglou said he and Serena Williams had decided not to do any on-court coaching, even at the tournaments on the professional women's WTA circuit where it is permitted.
Coco Vandeweghe was in two minds whether to answer the call when an unknown number with a strange international dialling code popped up on her telephone last year.
Russians Ekaterina Makarova and Elena Vesnina beat Martin Hingis and Italy's Flavia Pennetta 2-6, 6-3, 6-2 to capture the U.S. Open doubles title on Saturday, denying the Swiss a return to the Flushing Meadows winner circle for the first time in 16 years.
World number one Novak Djokovic and number two Andy Murray crashed out of the Western and Southern Open within an hour of each other on Friday, before Rafa Nadal restored order with a win over old rival Roger Federer.
The 28-year-old Spaniard sustained the injury in practice last month and has been training with a cast on his right wrist, forcing him to miss the Rogers Cup in Toronto and last week's Cincinnati Open.
Venus Williams stands in the way of younger sister Serena's bid for a calendar-year Grand Slam after reaching the quarter-finals with a 6-2, 6-1 rout of Estonian teenager Anett Kontaveit on Sunday.
The Serena Williams show continued at the US Open as the world number one moved a step closer to a calendar Grand Slam on Wednesday, while Mardy Fish took a final Flushing Meadows bow as the curtain came down on the American's career.
World No 1 Novak Djokovic and Serena Williams advanced safely to the next round of the US Open on Saturday but the women's draw saw yet another big upset as Wimbledon winner Petra Kvitova was sent packing by a 145th-ranked qualifier.
Fifth seed Maria Sharapova averted an early exit on a sweltering day in Flushing Meadows. Updates from Wednesday's play.
Williams had little trouble against the 31-year-old German although the gusty breezes at Auckland Tennis Centre played havoc with her ball toss, especially when she was serving for the match at 5-3 in the second set.
"I feel like I'm more... I wouldn't say confident but I'm more, like, I have inner peace. I don't know. Like zen. I don't really want to use words I don't know.'
A bullish Sumit Nagal says he has learnt to control his inner demons and is ready to cause "more damage" on the ATP circuit after a spirited show against Roger Federer on his Grand Slam debut.
IMAGES from Day 8 of the French Open at Roland Garros on Sunday.