Serena and Venus have been pictured preparing for their respective US Open fourth round matches side by side at Flushing Meadows.
The picture, which was uploaded to Instagram by Venus, shows the sisters hitting their trademark forehand shots on the practice courts in New York.
The pair, if all goes to plan, could face each other in the semi-finals if they both progress past the fourth round and the quarter-final stage.
World No 1 Serena plays Kazakhstan’s Yaroslava Shvedova in the fourth round.
The six-time US Open champion hasn’t lost a set at this year’s tournament.
Sister Venus faces a much tougher test against 10th seed Karolina Pliskova from Czech Republic.
Venus, who is seeded 6th, hasn’t lost a set since the first round when she beat Kateryna Kozlova.
Serena’s victory over Johanna Larsson in the third round was a record 307th grand slam match win for her.
The No 1 seed, clearly a little overwhelmed, said: ”That’s pretty awesome and what a place to do it, where everything first started.”
It meant that she moved ahead of Martina Navratilova and on level terms with Roger Federer.
She added: “To be up there with both men and women is something that’s super rare, and it actually feels really good.”
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