Djokovic dropped only three games against Klizan.
Defending champion and world number one Andy Murray was swept aside by home favourite Fabio Fognini at the Italian Open on Tuesday, being completely outplayed in a 6-2, 6-4 defeat.
Rediff.com gives you a flashback of these events in pictures snapped right here...
A winner of 12 Grand Slam titles, the Serb has suffered a noticeable dip in form since winning his maiden French Open last June, relinquishing top spot in the ATP rankings to Briton Andy Murray five months later.
A floundering Novak Djokovic should seek advice from evergreen Swiss maestro Roger Federer in order to rediscover his vintage self, the Serb's former Davis Cup coach Bogdan Obradovic said.
Chris Evert - along with John McEnroe - told reporters that air quality should be paramount in tournament organisers' minds.
The Citi Open in Washington, which was scheduled to restart the men's ATP Tour after the COVID-19 shutdown, has been cancelled for 2020, organisers announced on Tuesday. The tournament was set to begin on August 14 and serve as a build-up for the US Open but the organisers said concerns about travel restrictions and recent trends in the coronavirus outbreak had led to the decision to scrap the event.
Images from Day 1 of the 2022 US Open at the USTA Billie Jean King National Tennis Center, in Flushing Meadows, New York, on Monday.
IMAGES from the US Open matches played on Day 1 at the Flushing Meadows in New York on Monday.
Novak Djokovic has been unbeaten at Wimbledon since retiring with an elbow injury against Tomas Berdych in the 2017 quarter-finals.
Rafael Nadal is adamant that he will not be discouraged by the memory of recent Wimbledon woes as he prepares to follow up his landmark 10th French Open triumph with a third success on the sport's most storied lawns.
The Scot said it is still too early to make a call on whether was ready for the rigours of a two-week Grand Slam with best-of-five-set matches.
Nadal braced for tough Cilic test in Melbourne showdown
The eight men to watch during the US Open which starts on Monday.
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.
Jack Sock celebrated a pair of firsts on Friday by powering past fourth seed Kei Nishikori 6-3, 2-6, 6-2 to book a date with Roger Federer in the semi-finals of the BNP Paribas Open in Indian Wells, California.
Defending champions Indian Aces bounced back in style to beat Singapore Slammers 27-20 and record their second successive win in the Japan leg of the International Premier Tennis League (IPTL) season 2 in Kobe.
Roger Federer avoided any more security scares as he moved smoothly into the third round of the French Open on Wednesday but danger still lurks in the bottom half of the draw, namely in the shape of Japan's Kei Nishikori.
The second round match against Argentine Federico Delbonis lacked nothing in quality power tennis but was almost entirely devoid of drama and the most notable incident came late in the third set when the ball flew off top seed Nadal's racket and hit a ballgirl on the head.
A 30-year-old German journeyman who once travelled around Europe's Challenger Circuit in a camper van joined a list of Wimbledon luminaries who go by the names of Lukas Rosol, Steve Darcis and Nick Kyrgios.
'Irresponsible' Djokovic panned for Adria Tour misadventure.
Ana Ivanovic and Gael Monfils led the way for Indian Aces as they edged out Manila Mavericks 26-25 in a thrilling encounter in the India leg of the International Premier Tennis League.
Rafael Nadal will have his work cut out when play begins next week, not on the Caja Magica's three red dust courts, but on gaming consoles.
India's Leander Paes and Rohan Bopanna along with their respective partners crossed the opening hurdle of the men's doubles event with hard-fought victories, even as Sania Mirza posted an easy win in the women's doubles at the French Open in Paris, on Wednesday.
Zverev deserved to be thrown out for umpire abuse, says Nadal
Rafael Nadal is tied with Roger Federer as the player with the most men's singles majors and the Spaniard can now overtake his great rival who has skipped the Australian Open.
Top seed Serena Williams dropped the second set before bouncing back to beat compatriot Christina Mchale 6-3, 5-7, 6-2 in second-round action at the Miami Open in Florida on Thursday.
'Baby Fed' steals hearts with the same ease that he wins matches.
Two years after Spain's stunning fall from grace in Davis Cup tennis, Rafael Nadal has hailed his nation's return to the World Group after victory in the playoff against India.
'I'm tempted to say that he's in a better place now, but I'm quite sure he's not.' 'There was no better place for him than the basketball court, and now he'll never set foot on one again. Because he's gone,' says Dhruv Munjal.
'Not only are four of the top five fathers, but Federer famously injured a knee, weakened by years of twisting and turning on tennis courts, early this year while giving his elder pair of twins a bath.'
Federer's hard-fought 6-7 (5), 7-6 (8), 10-7 victory over American John Isner put the Europeans just three points from their victory target and Zverev got them there with a 6-7 (3), 7-5, 10-7 win over Kevin Anderson.
All eyes were fixed on longtime rivals Federer and Djokovic as they took the court for the final match, combining forces to play together for the first time after Team Europe had swept the first three singles matches.
Defending champion Novak Djokovic's preparations for Wimbledon have been laid back in the extreme.
While the year's final grand slam is just underway tennis fans have circled Sept. 8 when, if all goes to form, Nadal and Federer would meet to decide a place in the final.
Images from Day 4 of the Wimbledon tennis championships played in London, on Wednesday.
Playing his first match since injuring his knee at Indian Wells last month, Nadal showed no signs of rust as he raced into a 5-0 lead in the first set on Court Rainier III.
Bautista Agut played in Spain's victories over Russia and Croatia but left the team and returned to Castellon after the health of his father Joaquin deteriorated.
Novak Djokovic beat Daniil Medvedev in the US Open final to win a 24th Grand Slam singles title and equal Margaret Court's record haul.
Aryna Sabalenka of Belarus and Paula Badosa of Spain, earned second-round wins
