Watson through for Britain
Heather Watson became the third British player to reach the second round at Wimbledon with an impressive win over Ajla Tomljanovic.
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The 22-year-old matched her fellow British number one Andy Murray as she brushed aside Croatian Tomljanovic 6-3 6-2 on Court Three, joining Naomi Broady in round two of the women's singles.
Watson arrived at Wimbledon fresh from a run to the semi-finals at Eastbourne, which lifted her ranking up to 60th.
In February she was ranked 100 places lower, a legacy of the glandular fever she struggled to overcome all of last season.
This year has been a completely different story, with the British number one reaping the benefits of good health and a more aggressive approach under coach Diego Veronelli.
Tomljanovic, 21, had never won a match at Wimbledon but is one of the rising talents of the game and defeated Agnieszka Radwanska on her way to the fourth round of the French Open.
The first set was a story of chances taken and chances missed, with Watson converting her only break point in the second game and saving all four break points she faced.
Tomljanovic certainly possesses the power to be a danger on grass but Watson refused to be pushed back and the Croatian began to go for too much.
Watson was not lacking in the power stakes either, hitting 17 winners to her opponent's 16, with one forehand down the line in the fifth game of the second set in particular an indication of the strides she has made.
By that stage she was already a break up and she broke again before winning a fifth straight game to move to the brink of victory.
Tomljanovic, ranked at number 53, forced Watson to serve it out, which she did with aplomb to set up a second-round meeting with either ninth seed Angelique Kerber or Urszula Radwanska.
Serena Williams served notice of her plans for this Wimbledon fortnight by slinging down 16 aces in a mismatch of a first-round showdown with Anna Tatishvili.
The top-seeded American is seeking a sixth women's singles title in London and raced to a 6-1 6-2 victory over an opponent who has recently joined her playing under the Stars and Stripes, after previously representing Georgia.
On court the pair were worlds apart, with Williams showing why she is a hot favourite to triumph on Saturday week and claim the Venus Rosewater Dish she last held aloft two years ago.
The only worry for Williams, who joins sister Venus in the second round, was a succession of slips she suffered on the Centre Court grass.
"I fell so many times. It was weird because I usually feel really good,'' Williams said.
''I just kept falling today but it's probably (about) getting my bearings. I didn't play much grass last year and so I think I'll be okay."
Of the prominent seeds, only number seven Jelena Jankovic lost on the second day of the championships, although she has never gone beyond the fourth round at the All England Club. It was barely a surprise when she tripped up 6-3 6-2 against Estonian Kaia Kanepi, a two-time quarter-finalist who beat British hope Laura Robson in the fourth round last year.
Newly-crowned French Open champion Maria Sharapova charged through at the expense of Robson's lesser-acclaimed compatriot Samantha Murray, winning 6-1 6-0, while Romanian third seed Simona Halep swatted aside Brazilian Teliana Pereira 6-2 6-2.
Sabine Lisicki began her quest to go one better than last year's runner-up achievement by posting a resounding Centre Court victory.
Returning to the scene of her humbling by Marion Bartoli in a one-sided women's singles final, German Lisicki overcame early jitters to overwhelm Israel's Wimbledon novice Julia Glushko by a 6-2 6-1 margin.
"I love that court so much. It definitely helped me. The crowd, as well, helped me to settle very quickly," Lisicki said.
Bartoli, having retired from tennis since her thrilling title success, appeared on court before Lisicki and Glushko began their match, receiving a rapturous welcome back. She watched the contest from the Royal Box.
Agnieszka Radwanska, the fourth seed, also won 6-2 6-1 in her opening match against Romanian Andreea Mitu, which began on Monday but was carried over following late-evening rain that halted play.
The former world number one Caroline Wozniacki was another who had to come back on Tuesday to complete an opening match, and the 16th-seeded Dane converted a set and 2-0 lead over Israel's Shahar Peer into a 6-3 6-0 victory.
France's Caroline Garcia, once tipped to be a world-beater by Andy Murray, knocked out Italian 14th seed Sara Errani, posting a fine 2-6 7-6 (7/3) 7-5 win.
Both finalists from Eastbourne posted straight-sets successes, with Aegon International winner Madison Keys joining the American contingent in the last 64 by fending off Puerto Rican Monica Puig 6-3 6-3, and runner-up Angelique Kerber a 6-2 6-4 victor against Urszula Radwanska.
Canada's Eugenie Bouchard fought her way through a particularly difficult opener against Daniela Hantuchova, with the 13th seed prevailing 7-5 7-5. Twenty-year-old Bouchard has reached the semi-finals of both the Australian Open and French Open already this year.
She was back on Court One, where she won the girls' title two years ago, and said: "I feel more eyes on me, for sure, and expectation to win more matches. Being higher ranked than most opponents most of the time, there's that expectation to win.
"I really try not to focus on it. There's so much that's said around me, I try to ignore most of it and focus on my game.
"So hopefully my next match I'll try to improve from this one. I'm proud of the way I fought. Tough opponent in the first round. It was a really tough match."