Cilic's booming serve lacked its usual accuracy and Germany's Kohlschreiber was able to control long rallies, pushing the towering Croatian around the court with pinpoint groundstrokes en route to a quick victory.
Roger Federer boasted of his fitness, Maria Sharapova felt a bit rusty and Andy Murray berated himself but all three eased into the second week of the Australian Open with third round victories at Melbourne Park on Saturday.
Defending champion Naomi Osaka of Japan was upset 7-5, 6-4 by Belinda Bencic in the fourth round at the US Open on Monday as the Swiss reached the quarter-finals for the second time.
Images from the matches played on Day 7 at the Roland Garros on Saturday
Some of the big moments of the sporting world from 2010-2019!
The lanky wild card kissed the Montreal court after completing a rousing 3-6, 6-4, 7-6(4) triumph as the 18-year-old became the youngest player to ever reach the quarter-finals of an ATP Masters 1000 event.
A day after celebrating his 36th birthday, Federer played the aggressive game that has propelled him to five titles, including two grand slams, this year, attacking the net and rocketing second serves.
A summary of sportspersons in the news on Sunday.
Bernard Tomic is set to sit out the Australian Open after Tennis Australia (TA) decided not to award him a wildcard to the main draw, the organisers said on Thursday.
The Danish World No 3 ended 2017 with the biggest title of her career in Singapore and returned a day after thrashing Madison Brengle in her season opener to hit 21 winners against eight unforced errors in the 53-minute win over Martic.
IMAGES from the Australian Open matches played at Melbourne Park on Wednesday
The 17-time Grand Slam champion will turn up for Indian Aces against Singapore Slammers in the third leg on Sunday.
A summary of sports events and persons who made news on Friday
The US Open is the biggest tournament in America's tennis calendar. Enough reason for the big personalities from Hollywood, former tennis champions and other celebrities to catch their favourite tennis stars in action.
IMAGES of the all the action from Day 2 of the Australian Open played at Melbourne Park on Tuesday
Roger Federer's countless fans did not have enough of him on his rare Indian sojourn, and the Swiss superstar reciprocated their feelings saying that one day he will travel the 'beautiful country in a big way'.
IMAGES from Day 3 of the US Open in New York on Wednesday.
Photos from the US Open matches played on Monday
It was a day of surprises at Flushing Meadows in New York as seeded players were knocked out one after the other on Friday.