Top seed Novak Djokovic overcame a dogged challenge from 81st-ranked Korean Kwon Soon-woo and his own grasscourt rustiness to reach the Wimbledon second round with a 6-4, 3-6, 6-3, 6-4 victory on Monday.

The defending champion, bidding for his fourth Wimbledon title in a row, looked out-of-sorts at times against Kwon, who brought a lively mixture of tennis, from booming forehands to delicate drop-shots, onto Centre Court.

The 24-year-old Korean broke Djokovic's serve in the fourth game of the second set and went on to win it with a drop-shot and a big serve.

But the 35-year-old Serb, aiming to win a 21st Grand Slam title, recovered enough of his trademark consistency to see off the challenge.

Djokovic, who played no grass-court warm-ups before the championships, secured victory with an ace on his first match point and will next meet either Thanasi Kokkinakis or Kamil Majchrzak.

Britain's Norrie eases through after rain delay

Ninth seed Cameron Norrie made light work of Spain's Pablo Andujar to give Britain its first win at this year's Wimbledon, easing through 6-0 ,7-6(3), 6-3.

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With the home spotlight very much on Centre Court where fellow Britons Emma Raducanu and Andy Murray were in action later, Norrie opened proceedings on Court Two.

Left-hander Norrie, the highest-ranked home player in the men's draw, dominated the opening set against the 36-year-old who looked uncomfortable on the grass.

Anjujar, who had suffered six first-round defeats in his eight previous Wimbledon appearances, broke serve early in the second set but Norrie recovered and moved two sets ahead when he comfortably took a tiebreak.

Norrie was gifted a break to love in the third game of the third set and moved to the brink of victory at 3-5 on the Anjujar serve but failed to convert three match points before heavy rain forced the players off court.

On the resumption, Norrie completed the job with a backhand pass to move into round two.

"That was not easy. I saw the dark clouds coming and someone shouted out 'get it done before the rain' - I was like 'come on, I'm trying to get it done," Norrie said.

"A lot of waiting around and it wasn't the prettiest performance but I got it done in straight sets and I'll take that and move on."

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Seventeen British players started out in the singles main draw, the most since 2001.

Jodie Burrage became the first of the home contingent to lose after going down 6-2, 6-3 to Ukraine's Lesia Tsurenko.

Third seed Ruud seals maiden Wimbledon win at third attempt

Norwegian third seed Casper Ruud registered his maiden Wimbledon victory in his third main-draw appearance when he saw off experienced Spaniard Albert Ramos-Vinolas 7-6(1), 7-6(9), 6-2 in the first round.

French Open runner-up Ruud failed to get past the opening hurdle in 2019 and 2021 and arrived at this year's grasscourt Grand Slam following a first-round loss at Queen's to world number 180 Ryan Peniston.

The odds were again stacked against the 23-year-old Ruud, who once joked that grass is for golfers, as he faced an opponent who had defeated him in three out of four career meetings -- though all the matches were on clay.

Ruud served strongly, dishing out 14 aces, and dominated the baseline battle against the left-hander during a rain-interrupted match.

Both players had opportunities in the first set but neither managed a service break before Ruud dictated terms in the tiebreaker to nose ahead.

The 34-year-old Ramos-Vinolas, ranked 34th, traded two service breaks with his opponent in the second and had four set points in the tiebreaker to level the contest but ended up losing it to fall 2-0 behind.

Ruud grew in confidence as the Spaniard's challenge melted away and after two breaks in the third set the Norwegian sealed victory to set up a meeting with Argentine Tomas Martin Etcheverry or Frenchman Ugo Humbert.