Roger Federer suffered a shock 3-6, 7-6(7), 7-6(5) loss to world number 116 Evgeny Donskoy of Russia in the Dubai Open second round on Wednesday.
World No 14 Marin Cilic is through to the semi-finals of the Kremlin Cup after the Croat easily beat Russia's Andrei Kuznetsov 6-2, 6-1 on Friday.
Somdev Devvarman fought past Evgeny Donskoy in straight sets to breeze into the final of the Delhi Open.
Continuing his impressive comeback post a shoulder surgery, Somdev Devvarman erased a one-set deficit to beat World No. 78 Evgeny Donskoy in his opening round of the ATP Miami Masters.
Australian Open champion Novak Djokovic and third seed Andy Murray both had to work much harder than expected to book their places in the third round of the BNP Paribas Open on Sunday.
India's Ramkumar Ramanathan stormed into the singles semi-finals of the Eckental Challenger with a ruthless win over fourth seed Evgeny Donskoy, in Eckental, Germany, on Friday.
Indian tennis players' struggle at the Grand Slam events continued as both Sumit Nagal and Ramkumar Ramanathan lost their respective first round singles matches to make an exit from the US Open qualifiers.
There will be no Indians in this year's French Open singles draw as all three contenders, including Yuki Bhambri, bowed out after second-round defeats in the Qualifiers in Paris.
Yuki Bhambri was the only Indian to cross the first hurdle in the Australian Open qualifiers, Somdev Devvarman and Ramkumar Ramanathan falling by the way side, on Monday. Ranked 314th, he knocked out Russian 15th seed Evgeny Donskoy with a 4-6, 6-1, 8-6 victory in his first round match on Show Court 2.
Svetlana Kuznetsova thrashed defending champion and fellow Russian Anastasia Pavlyuchenkova to win the women's title 6-2, 6-1.
India's Ramkumar Ramanathan fought back from a set down to beat Germany's Marvin Moller 4-6, 6-1, 6-1 and enter the final of the Eckental Challenger tennis tournament, in Eckental, Germany, on Saturday.
Yuki Bhambri kept alive his hopes of making the Australian Open singles main draw, scoring a straight sets victory over higher-ranked Yoshihito Nishioka in the qualifying event.
Top seed Somdev Devvarman won his match against Jordi Samper Montana of Spain via a walkover to set up a semi-final clash with his Indian compatriot Yuki Bhambri in the $50,000 ATP Challenger Tennis tournament in Chennai on Thursday.
India's Yuki Bhambri fashioned an impressive if not dominating win to clinch his second title of the season with a 6-2, 7-6(4) defeat of second seed Evgeny Donskoy in the final of the $50,000 KPIT-MSLTA Challenger, in Pune, on Saturday.
Yuki Bhambri emerged triumphant in the contest between the country's leading tennis players, brushing aside the challenge of India No 1 Somdev Devvarman in straight sets to breeze into the final of the ATP Challenger in Chennai on Friday. Ranked 71 places below his compatriot at 174, Yiki beat the top seeded 6-2, 6-4 in an hour and 41 minutes in the semi-finals of the US $50,000 hard court event.
Wimbledon marathon man John Isner was forced to retire after two games of his second round match against Frenchman Adrian Mannarino with a knee injury on Wednesday.
Surprisingly, Yuki Bhambri has preferred a smaller $50,000 Challenger tournament in Kobe, Japan, while Ramkumar Ramanathan has to attend a mandatory ATP educative programme in London.
India's Sumit Nagal put up a strong fight before going down in three sets to Serbian Vicktor Troicki in the men's singles opening round in the third edition of the Tata Open Maharashtra, in Pune, on Monday.
Daniil Medvedev fired Russia to victory in the $7.5 million ATP Cup with a dominant performance against Italy in Melbourne on Sunday.
Andy Murray saved seven match-points in a 31-minute tiebreak that stretched to 38 points before he finally subdued Germany's Philipp Kohlschreiber 6-7(4), 7-6(18), 6-1 to reach the Dubai Championships semi-finals on Thursday.
Fresh from winning the Chennai leg, Yuki Bhambri advanced to the second round, even as the other two Indians Saketh Myneni and Vishnu Vardhan made quiet exits in the $50,000 ATP Challenger at BTA Courts in Kolkata.
Ageing tour warrior Lleyton Hewitt ushered Australia into the Davis Cup semi-finals on Sunday, trouncing Aleksandr Nedovyesov 7-6(2), 6-2, 6-3 in the decisive singles rubber against Kazakhstan.
Britain's Andy Murray enjoyed a routine win over Argentina's Juan Monaco to ease into the third round of the tennis tournament at the Rio Games on Tuesday, while Spain's world number nine David Ferrer was knocked out.
In the crucial ninth game Suarez Navarro seemingly held but Sabalenka challenged an ace at 40-15 and won the discussion.
The 35-year-old Swiss, showing no sign of losing his edge, improved to 19-1 this year, winning the Australian Open in five sets over Nadal, and BNP Paribas Open in straight sets over fellow Swiss Stan Wawrinka.
Playing alongside Australian partner Matthew Ebden, the eight-time doubles Grand Slam champion Leander Paes showed his class during a clinical victory over defending champion and second seed Sharan, who was playing alongside New Zealand's Artem Sitak.
It will be the earliest meeting between the two since their first professional match in the second round of the 1998 Australian Open.
Top seed Somdev Devvarman struggled past Ramkumar Ramanathan, who was troubled by cramps, but Yuki Bhambri made a fluent start with a straight sets victory in the US$ 50,000 ATP Challenger event, in Chennai.
Murray, who is attempting to return to the top of the tennis world after undergoing hip surgery in January, was out of sorts in the first set of the rain-delayed match, losing three service games behind some uncharacteristically soft second serves.
The 36-year-old Swiss master needs only to reach the semi-finals at the ABN Amro tennis event to overtake Rafael Nadal at the top of the ATP rankings and become world number one for the first time since November 2012.
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.
Roger Federer stared down defeat and saved two match points before knocking Tomas Berdych out of the Miami Open on Thursday with a 6-2, 3-6, 7-6(6) victory in their thrilling quarter-final.
A summary of sports events and sports persons, who made news on Wednesday
US Open champion Martin Kaymer sank an eight-foot birdie putt at the first extra hole to beat Bubba Watson in the four-man PGA Grand Slam of Golf in Bermuda on Wednesday.
Images from the third day at the US Open, the final Grand Slam tournament of the year, in New York, on Wednesday:
Former world number one Andy Murray withdrew from the Brisbane International with a hip problem on Tuesday, further putting in doubt the Briton's prospects of being fit in time for the Australian Open later this month.