Eight-time champion Roger Federer and seven-time winner Serena Williams shrugged off 30-degree heat to breeze into the Wimbledon second round
Top seed and defending champion Roger Federer began his quest for a record-extending ninth Wimbledon title with a convincing win over Serbian Dusan Lajovic on Monday.
The 36-year-old Swiss 35 winners and did not face a break point in a 6-1 6-3 6-4 victory over the world number 57 on Centre Court.
Three-times Grand Slam winner Stan Wawrinka returned to the All England Club in style, ousting sixth-seeded Bulgarian Grigor Dimitrov 1-6 7-6(3) 7-6(5) 6-4.
Wawrinka's ranking has plummeted to 224th as he continues to rediscover his form and fitness after knee surgery last year.
"I will do everything to be ready for the next round," said Wawrinka, who next faces Italian qualifier Thomas Fabbiano.
In the women's draw, seven-times champion Serena Williams marked her return to Wimbledon for the first time since becoming a mother with a 7-5 6-3 first-round win over Dutchwoman Arantxa Rus.
Australian Open champion Caroline Wozniacki needed less than an hour to book her second-round spot, beating American Varvara Lepchenko 6-0 6-3.
Fifth seed Elina Svitolina struggled to find her rhythm as she committed 44 unforced errors in a 7-6(3) 4-6 6-1 defeat by Germany's Tatjana Maria.
Czech Katerina Siniakova comes back from 5-3 down in the decider to beat American CoCo Vandeweghe 6-7(3) 6-3 8-6 in a three-hour thriller on Court Three.
Croatian Ivo Karlovic, making his 14th Wimbledon appearance at the age of 39, launched 36 aces in a 4-6 7-5 7-6(7) 6-3 victory over Russia's Mikhail Youzhny.
Five-times champion Venus Williams overcame a slow start to beat Swede Johanna Larsson 6-7(3) 6-2 6-1 and avoid her third career first-round exit at the All England Club.
American Sloane Stephens, runner-up at the French Open last month, admitted she struggled to make the transition from clay to grass after losing her opening-round match to Croatian Donna Vekic.
"Just a lot of things weren't going as I would have liked them to," Stephens told reporters. "Sometimes it happens.
"The balls from clay to grass are completely different. The ball stays very low here. You have to make a little bit more of an adjustment."
Sam Querrey, who got married to Abby Dixon last month, said he postponed his honeymoon plans to step up his grasscourt preparations for Wimbledon.
"We went home for three days and flew over for Queen's (Club), if you count that as a honeymoon," the 30-year-old American told reporters. "I don't think she (Abby) does."
"Maybe at the end of the year we will do a honeymoon somewhere close to where we live."
Frenchman Lucas Pouille, seeded 17th, dropped the third set but recovered well to put away American Denis Kudla 6-3 6-3 2-6 6-3 in just over two hours.
Last year's runner-up Marin Cilic continued his fine run on grass this season with a 6-1 6-4 6-4 win over Yoshihito Nishioka of Japan.
The third-seeded Croatian claimed the Queen's Club crown last month for the second time in his career.
American Sam Querrey, seeded 11th, fired 15 aces on his way to a 6-2 6-4 6-3 victory over Australian Jordan Thompson.
Romanian Sorana Cirstea outplayed last year's semi-finalist Magdalena Rybarikova in a 7-5 6-3 victory to record the first upset of the championships.