Reigning champion Williams was in no mood to hang around on Court Two
Serena Williams handed Anna Chakvetadze a 6-0 6-1 thrashing to book her place in the third round of Wimbledon.
The American top seed looked set to 'double bagel' her Russian opponent until Chakvetadze finally won her own serve in game six of the second set.
Williams was out on Court Two and admitted afterwards: "I have mixed feelings about playing on there.
"I don't think I should be out there but when I was leaving, I stayed for a while and signed autographs.
"That definitely made up for it to see my fans. I saw so many kids there and gave some things away and it was fun."
Williams described meeting the Queen before play started as "a very unbelievable moment" and also urged Wimbledon officials not to scrap the final set tie-break in the wake of the John Isner-Nicolas Mahut marathon.
She added: "The Isner match definitely got a lot of eyes on the sport. I thought that was cool really but I was happy not to be playing afterwards. I know John, so I was really happy that he won, but I was thinking I was glad it wasn't me.
"It is a once in a lifetime thing. I like how the rules are at Wimbledon - this doesn't happen too often so I don't think they should introduce a last-set tie-break."
Maria Sharapova reached the third round with a comfortable 6-1 6-4 win over Ioana Olaru of Romania.
Sharapova made smooth progress into the third round
The Russian 16th seed and 2004 champion breezed through the first set but Olaru made the second more of a battle.
She broke back in the eighth game to level the set but handed the advantage back to the Russian in the following game with a double fault.
Sharapova will play Czech Barbora Zahlavova-Strycova in round three.
The 24th seed, dropped the first set against Slovakia's Daniela Hantuchova before battling back to win 1-6 6-2 6-4.
She will face an increasingly confident Sharapova, who is returning to something like her old form after a long-term shoulder injury.
"I made some errors but I'm happy that I made it through," Sharapova said after her second-round win.
"I've got to keep being aggressive. In the second set I was bit tentative but it got better.
"It's a thrill to be back. Last year I lost in the second round and I was thinking about that how and there's no way I was going home.
"I'm here to contend and I'm here to win the tournament."
In other matches on Thursday, Danish third seed Caroline Wozniacki saw off Chang Kai-Chen of Taiwan 6-4 6-3.
Wozniacki, the 2006 Wimbledon junior champion and 2009 US Open finalist, was rarely troubled by Chang, who was making her SW19 debut.
The Dane broke her serve to love in the third game for a decisive advantage in the first set and again in the third game of the second.
Unseeded Czech Klara Zakopalova fought back from losing the first set to beat 18th-ranked Aravane Rezai of France 5-7 6-3 6-3.
Russia's Svetlana Kuznetsova, a former US Open and French champion, continued her poor run in 2010, the 19th seed beaten 6-4 2-6 6-4 by compatriot Anastasia Rodionova.
Chinese 23rd seed and former semi-finalist Zheng Jie joined her in making an early exit, beaten 6-4 2-6 6-2 by another Czech Petra Kvitova.
Polish seventh seed Agnieszka Radwanska cruised through with a 6-2 6-0 win over Italy's Alberta Brianti.
Radwanska reached the fourth round as a 17-year-old in 2006 and is seeded to meet defending champion Serena Williams in the quarter-finals this year.
Italian 10th seed Flavia Pennetta raced into the next round with a 6-1 6-1 thrashing of Romania's Monica Niculescu.
Estonian qualifier Kaia Kanepi, who knocked out sixth seed Sam Stosur in the first round, beat Edina Gallovits 6-4 7-5 to reach the third round for the first time.
Sharapova eases through to round three