The 20-year-old, who reached the Australian Open last four and won titles on clay and indoor hard courts this year, has had a difficult time of it on grass.
US-based Prakash Amritraj downed Bulgarian Grigor Dimitrov 7-6(3), 6-1 to sail into the singles second round of the Israel Open, while Rohan Bopanna and his American partner Travis Parrott beat Nicolas Almagro (Spain) and Sebastian Prieto (Argentina) 6-4, 5-7, 10-8 to move into the doubles second round at the BMW Open in Munchen, Germany.
Roger Federer and Andy Murray moved towards a likely showdown at the Cincinnati Masters on Thursday while Rafael Nadal took another encouraging step on his return from injury by joining them in the quarter-finals. Fourth seed Novak Djokovic also reached the last eight with a 7-5, 6-3 win over Jeremy Chardy of France.
World number three Novak Djokovic celebrated his return to action with a 7-6, 6-4 victory over France's Jeremy Chardy in the first round of the Marseille Open on Wednesday.
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.
India's tennis stars enjoyed comfortable wins in the Australian Open on Thursday as Sania Mirza eased into the second round with partner Martina Hingis while Rohan Bopanna also registered a straight sets victory in the men's doubles first round.
Ramkumar, who ended a runner-up at the Newport event last week, lost 4-6, 4-6 to American Taylor Fritz.
Top seed Jo-Wilfried Tsonga swept to a 6-4, 6-1 victory over Brazilian Thiago Alves in the first round of the South African Open in Johannesburg on Tuesday. The Frenchman was joined in the second round by second seed David Ferrer, fifth seed Jeremy Chardy and seventh seed Kristof Vliegen.
Andy Murray took another step towards securing a World Tour finals berth when he fought off a typically dogged David Ferrer to win 6-4, 7-5 and move into the final of the Valencia Open on Saturday.
Veteran Leander Paes brushed off the disappointment of Rio Olympics as he and his German partner Andre Begemann made it to the final of the ATP Winston-Salem Open beating Swede Robert Lindstedt and Pakistan's Aisam-ul Haq Qureshi in a close encounter.
News of all that's transpired on and off the tennis courts
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.
They beat Jeremy Chardy and Jonathan Eysseric of France 7-6 (4), 7-6 (2) to advance into the second round of the French Open.
With two men's five-set matches having caused a log-jam, Muguruza and Konta did not begin their match until 12:30 am local time (1330 GMT) on Friday at Margaret Court Arena, a record late start at the Grand Slam.
Murray was made to fight for two hours and 52 minute
Roger Federer, who will be chasing an 18th Grand Slam title at the Australian Open later this month, breezed through to the Brisbane International men's semi-finals with a 6-1, 6-1 thumping of Australian Marinko Matosevic.
Images from Day 5 of the French Open in Paris on Thursday.
World No. 3 David Ferrer has reached the semi-finals of the Valencia Open for the fourth consecutive year with a 6-4, 4-6, 6-0 win over fifth seed Jerzy Janowicz.
The 32-year-old, five-times a winner of the singles at the prestigious Wimbledon warm-up event, delighted a large evening centre court crowd with some fluent shot-making as he and Spanish veteran Lopez beat top seeds Juan Sebastian Cabal and Robert Farah 7-6(5), 6-3.
Novak Djokovic chalked up his 800th career victory to reach the semi-finals of the Fever-Tree Queen's Club championships on Friday and suggested he could play on past his 40th birthday.
Leander Paes has said he's all geared up to win a medal in next year's Rio Olympics.
A summary of the matches from Day 9 at the French Open.
Seventh seed Wawrinka of Switzerland set up a third-round meeting with Bulgarian ninth seed Grigor Dimitrov after seeing off Argentine Juan Monaco 6-4, 6-1.
Serena Williams and Marin Cilic both survived third round scares on Friday to keep their US Open title defences on track but there was no escape for Rafael Nadal with the twice-winner going down in a late night thriller.
Australian Nick Kyrgios was expelled from the tournament after going wild in the third set of his match against Casper Ruud.
Kei Nishikori swept aside Rafael Nadal in the quarter-finals of the Rogers Cup.
Summary of sports events and persons who made news on Saturday
Roger Federer and Lleyton Hewitt will resume one of the oldest rivalries in tennis when they contest the Brisbane International final on Sunday.
Date-Krumm, ranked 84, is a lengthy outsider to cause an upset against the dominant force in the women's game who is currently on a 33-match winning streak.
Gunning for a record seventh appearance at the Olympics this year, one more milestone beckons veteran Indian tennis star Leander Paes which is a testament to his longevity on the professional circuit. If the 42-year-old veteran manages to win 11 more matches on the ATP doubles tour this season, he will displace American Sherwood Stewart in the list of players with most number of doubles wins. Stewart is sitting sixth in the table with 728 wins while Paes, a winner of 17 Grand Slam titles, has taken his number to 718 after reaching the third round of the ongoing French Open in Paris. These staggering statistics do not include Paes' victories in the mixed doubles event and the ones on the ATP Challenger Tour. Last year when Paes recorded his last win of the season, he overtook Sweden's Jonas Bjorkman (712), ending 2015 with 713 wins.
Australian maverick Nick Kyrgios blazed past Feliciano Lopez with a barrage of aces to reach the semi-finals of the ATP 500 Fever-Tree championships at Queen's Club on Friday. The 23-year-old was in dazzling form as he claimed a 7-6(5), 7-6(3) victory over the defending champion to set up a clash with top seed Marin Cilic, who breezed past Sam Querrey.
The 16-times Grand Slam champion, who has been slightly ill lately, was kept on his toes before racing to victory to set up a meeting with seventh seed Stefanos Tsitsipas.
It will be the earliest meeting between the two since their first professional match in the second round of the 1998 Australian Open.
The Swiss squandered seven set points in the opener and although he took the second on a tiebreak he capitulated in the decider after dropping serve at 1-2, losing 7-5, 6-7(3), 6-1.
It is bound to fail like the earlier ones, again causing Pakistan enormously more damage than to India, points out Shekhar Gupta.
Second seed Novak Djokovic distracted the Roland Garros crowd but kept his focus as he made light work of Portuguese Joao Sousa to reach the second round of the French Open with a 6-1, 6-2, 6-4 win in Paris.
World No 55 Haase improved to a 2-2 career record against Zverev, including victories in their last two meetings.
World number five Alexander Zverev continued his poor recent form as he crashed out of the Italian Open in the second round while Serena Williams had to pull out of the women's draw with a recurring knee injury.
It was Kristyna's first win over a top-five ranked player and she will go on to play fellow Czech Barbora Strycova in the quarter-finals.
IMAGES from the matches played at the Miami Masters on Sunday