Simona Halep begins her Australian Open campaign against Kaia Kanepi on Tuesday in a rematch of their U.S. Open meeting which the world number one lost in straights sets.
Ramanathan, who is seeded 15th in the Qualifiers, lost 3-6, 4-6 to Italian Simone Bolleli, while 239th ranked Sumit Nagal, who is going through a rough patch, suffered his eighth straight first round defeat when he was thrashed 2-6, 0-6 by Poland's Kamil Majchrzak, ranked 192.
Serbia's Jelena Jankovic thrashed Lourdes Dominguez Lino of Spain 6-0 6-1 in the first round of the China Open on Monday, her first outing since her U.S. Open heroics two weeks ago.
The Indian ace won the first set but was outplayed in the next two by Francesca Schiavone in the second round of the US Open.
Rafael Nadal has a tough opener against Australia's Mark Philippoussis at the US Open.
World number one Federer is looking to become only the third man in the Open era, after John McEnroe and Ivan Lendl, to win the title three years in succession.
The Swiss is aiming to become only the third man to win three consecutive US Open titles in the professional era.
The teenager from Hyderabad jumped eight places after she added 134 points at the US Open
The Indo-Belarussian pair beat Argentina's Martin Garcia and Sebastian Prieto at Flushing Meadows.
Top ranked Serena Williams won her third consecutive U.S. Open women's championship when she defeated Denmark's Caroline Wozniacki 6-3, 6-3 on Sunday.
Roger Federer avenged his Wimbledon final loss to Novak Djokovic by beating the top-seeded Serb 7-6(1), 6-3 on Sunday to capture his second consecutive Western & Southern Open title.
Fifth seed Marat Safin has withdrawn from the U.S. Open because of a knee injury
The former champion has withdrawn from the U.S. Open with a lingering stomach muscle injury.
Not since Stan Wawrinka's 2016 US Open triumph has a Grand Slam been won by someone other than the 'Big Three', winners of the last 13 major titles.
Second seed Dominic Thiem celebrated his 27th birthday with a commanding 6-3, 6-3, 6-2 victory over India's Sumit Nagal on Thursday to move into the third round of the US Open.
World No 1 Novak Djokovic beat Roger Federer 6-4, 5-7, 6-4, 6-4 to win the US Open title at the Flushing Meadows in New York on Sunday.
When the match began it was Federer who surprisingly looked intimidated under the Arthur Ashe Stadium lights as he sprayed errors all around the court but the Swiss great woke from his slumber in time to turn the match resoundingly in his favour.
With the American men experiencing their longest US Open title drought in the Open era, Venus Williams led the American charge into round two on Monday with a 6-3, 3-6, 6-2 win over Viktoria Kuzmova of Slovakia.
US Open, the final Grand Slam of the season, starts Monday, August 28, at Flushing Meadows in New York.
This will be her first appearance at the tournament since she was ousted in the second round in 2017.
Four times now, twice at Wimbledon (2018, 2019) and at the US Open (2018, 2019) Serena Williams has come agonizingly close to that 24th Grand Slam only to fall at the final hurdle.
Bianca Andreescu, 19, the first Canadian to win a major in the professional era, prevented Serena Williams from equalling Margaret Court's record of 24 Grand Slam singles titles.
In an interview last month after a World Tennis Tour event at the Greenbrier in West Virginia, they said they had not yet decided whether they were finished competing. Playing almost exclusively with each other throughout their 25-year careers, the Bryans captured a professional era record 119 titles, including 16 Grand Slam wins, 39 ATP Masters 1000s and the ATP Finals title four times.
Lucas Pouille was not prepared to say his pulsating four hour, fourth-round upset of 14-time grand slam winner Rafael Nadal at the US Open on Sunday was a career changing moment.
Roger Federer will end the year as world number one for the third time in a row.
Former world number one Caroline Wozniacki eased into the semi-finals of the US Open on Tuesday with a ruthless 6-0, 6-2 win over wounded Latvian Anastasija Sevastova.
Photos from matches played at the US Open in Flushing Meadows on Sunday
Svetlana Kuznetsova powered to her first Grand Slam title by beating fellow Russian Elena Dementieva 6-3, 7-5 in the final of the U.S. Open.
The players from the States have won 34 Grand Slam singles titles in the last decade alone
Factbox on Rafael Nadal, who beat Novak Djokovic 6-0, 6-2, 7-5 on Sunday to win a record-extending 13th French Open title: