After one of those Williams sisters showdowns that rarely fail to disappoint, we are back to the old debate at a Grand Slam event about who might be able to stop Serena.
Following a crushing 6-1, 6-2 defeat both of them claimed that it was among the younger sibling's best performances in their 30 meetings.
Saturday was the first birthday of Serena's daughter, Olympia, and a year on from becoming a parent her movement on the court is starting to look back to its old efficiency.
Venus and Serena Williams embrace at the net after the latter won the US Open third round tie
Serena plays a ferocious forehand past her sister en route to winning in just 71 minutes
Not that there were any celebrations — the cause of some awkward moments during interviews last week amid all the gushing over her — as the American great is forbidden from indulging in such things as a Jehovah's Witness.
Instead, Williams. 36, was preparing for her fourth round against Estonia's veteran Kaia Kanepi, who upset top seed Simona Halep in the first round.
Venus's verdict on the match sounded ominous for other players left in the last 16. She said: 'I think it's the best match she's ever played against me. I don't think I did a lot wrong. She just did everything right.
'Obviously that level is definitely where she's going to want to stay during this whole tournament. She didn't win that match because I just rolled over. She played untouchable tennis.'
Venus, 38, struggled to cope with her sister's game as she crashed out of the tournament