PHOTOS from day two of the Wimbledon championships at the All England Lawn Tennis and Croquet Club in London on Tuesday:
Djokovic into second round
Novak Djokovic enjoyed the briefest of Wimbledon openings before booking his spot in the second round when opponent Martin Klizan retired through injury after the first set of their match on Tuesday.
Djokovic, a three times Wimbledon champion, had taken the first set 6-3 before Klizan called the trainer on court to treat a leg injury.
The 47th-ranked Slovakian emerged for the second set, but was moving gingerly and was immediately broken by Djokovic, who then held to consolidate his lead before Klizan limped towards the umpire to pull out.
Second seed Djokovic, who is chasing a 13th Grand Slam title, came into Wimbledon after enduring a difficult year in which he relinquished his number one ranking as well as his grip on all four majors.
He will play Czech Adam Pavlasek in the next round.
Federer marches on after opponent retires
Seven-time champion Roger Federer reached the second round after his opponent Alexandr Dolgopolov pulled out 6-3, 3-0 down in the second set.
Dolgopolov needed treatment to his right ankle after losing the opening set.
Plsikova races through
Third seed Karolina Pliskova beat Russian Evgeniya Rodina 6-1, 6-4 to reach the second round.
The Czech world number three will be hoping to improve her record at the championships after losing in round two on her last four appearances.
Sixth seed Milos Raonic won his first round clash 7-6(5), 6-2, 7-6(4) over German Jan-Lennard Struff.
The big-serving Canadian hit an impressive tally 55 winners, including 20 aces during the match.
Raonic will meet 2012 quarter-finalist Mikhail Youzhny in the next round.
Kerber through to second round
Angelique Kerber enjoyed the honour of opening Centre Court proceedings on Tuesday in the absence of title holder Serena Williams and, while she looked far from her best, she reached the Wimbledon second round with a 6-4, 6-4 win over Irina Falconi.
The German world number one, a first round loser at the French Open just five weeks ago, has been struggling to recapture the form that carried her into three Grand Slam finals in 2016.
However, Kerber, who won two of those majors and finished runner up to Williams at the All England Club last July, ensured she would not add her name to the list of Wimbledon top seeds to have perished in the opening round.
Instead, she survived the plucky challenge of American qualifier Falconi to register her first win at a grand slam tournament since bowing out in the fourth round at January's Australian Open.
Falconi had her chances to chalk up her first win in five appearances at Wimbledon, breaking Kerber once in each set.
However, the world number 247's lack of experience eventually caught up with her and a double fault handed Kerber two break points for a 5-4 lead in the second set.
The German converted the second and then finished with a flourish, holding to love to seal the match with a forehand winner.
Next up for her will be Belgian Kirsten Flipkens.
Muguruza off to a winning start
Spaniard Garbine Muguruza launched her campaign with a convincing 6-2, 6-4 win over Ekaterina Alexandrova in just over an hour.
The 2015 finalist produced a fine performance, claiming 9 of 11 points at the net.
Del Potro battles past Kokkinaki
Argentina's Juan Martin Del Potro rallied to see off Australian Thanasi Kokkinakis 6-3, 3-6, 7-6(2), 6-4 in just over three hours on Court Two.
American Coco Vandeweghe has reached the second round with a 7-5, 6-2 win over Mona Barthel of Germany.
The 24th-seeded Vandeweghe, who has teamed up with former men's champion Pat Cash, recorded an impressive tally of 30 winners to seal the victory.
Ferrer knocks out Gasquet
Spaniard David Ferrer beat 22nd seed Richard Gasquet of France 6-3, 6-4, 5-7, 6-2 to maintain his record of always winning his first round matches at Wimbledon.
The 35-year-old Ferrer, twice a quarter-finalist, is making his 14th appearance at this year's championships.