Seven-times champion Serena Williams moved up a gear at Wimbledon to beat Bulgarian qualifier Viktoriya Tomova 6-1 6-4 on Wednesday and reach the third round.
The 36-year-old American barely broke sweat in a one-sided first set but was tested by the world no.135 in the second without ever looking troubled.
While the Centre Court crowd clearly appreciated the sight of Williams in full flow they took a shine to the plucky Tomova who battled hard to make a match of it.
Even ultimate warrior Williams, who was unable to defend her 2016 Wimbledon title last year because she was pregnant, applauded a couple of her opponent's winners late in the second set before completing victory in 66 minutes.
"It was better than my first round and I'm happy that I'm going in the right direction," said 25th-seeded Williams.
Serena's victory followed elder sister Venus' hard-fought battle to see off Romania's Alexandra Dulgheru 4-6 6-0 6-1.
Five-time champion Venus, 38, turned up the heat after getting off to a rocky start and defeated her world No. 141 opponent in just under two hours, advancing to the third round for the 18th time in her career.
Elsewhere, Karolina Pliskova proved too strong for Victoria Azarenka in the battle of former world No.1s, prevailing 6-3 6-3 in 72 minutes to enter the third round at Wimbledon for the first time in her career.
The Czech world no.8 had lost in the second round at the All England Club for five straight years since 2013.
She next plays in-form Romanian Mihaela Buzarnescu, who hardly broke sweat as she dismissed Briton Katie Swan 6-0 6-3 in one hour 14 minutes.