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Viewers in the US will be able to watch the tournament in its entirety on ESPN and ESPN 2, with the former airing the entire first week of play, while the latter will broadcast outer court matches during the second week.
Federer barely broke a sweat and romped to another straight-sets win against the world number 58, having seen off Lajovic in the second round a year ago. Even the match point was on a knife-edge.
"I feel like a superhero", Williams had said after her Grand Slam comeback in Paris, where she caused a sensation wearing a black catsuit until a pectoral injury cut her return short.
The Spaniard, seeded second behind 2017 champion Roger Federer, won 6-3 6-3 6-2 against the world number 127.
The second-seeded Nadal hadn't played a match since claiming his 11th French Open title last month, but showed little sign of rust as he cruised to victory. "As long as he's here, I'm going to try to be here". "Life goes on", said Stephens, who was followed out of the tournament by Bulgarian sixth seed Grigor Dimitrov.
"And also mentally I have enough strength to be playing so many years".
This was Serena's first Wimbledon match after the birth of her first child.
Marin Cilic, who is the tournament's third seed, made light work of his first-round encounter against Japan's Yoshihito Nishioka wining 6-1, 6-4, 6-4 on the opening day.
The American returns to the tournament for the first time since claiming a seventh title in 2016 having missed past year to give birth to her daughter.
In the women's event, there were wins for Czech seventh seed Karolína Pliskova who defeated Britain's Harriet Dart 7-6 (7/2), 2-6, 6-1 and 10th seeded American Madison Keys, a 6-4, 6-2 victor over Ajla Tomljanovic of Australia.
But Karlovic's Croatian compatriot Borna Coric, who defeated Federer for the Halle title last week, was a first round loser against Russia's Daniil Medvedev 7-6 (8/6), 6-2, 6-2.