Another win, another milestone for Serena Williams who rolled into the US Open last 16 by crushing Sweden's Johanna Larsson 6-2 6-1 to collect grand slam victory number 307 - the most by a woman in the Open era.
As in the majority of her victories at the majors, Williams operated with ruthless efficiency but displayed little fire as she coolly dispatched the 47th-ranked Swede in exactly one hour.
The victory moved the 34-year-old American past Martina Navratilova and level with Roger Federer for most grand slam victories by a man or woman.
Williams will go for number 308 and a step closer to what would be a record seventh US Open title when she meets Kazakhstan's Yaroslava Shvedova, a 6-2 7-5 winner over China's Zhang Shuai, in round four.
Williams revealed she first heard about Navratilova's 307 grand slam singles wins at Wimbledon and says she takes great satisfaction in surpassing it.
"It was a really good feeling, I have to say," Williams said.
"It was a really good feeling, I have to say"
"To be up there with both men and women is something that's super rare, and it actually feels good.
"I was really excited to do that. Something I didn't even know about until Wimbledon. I was like, 'Oh, I have a new goal'.
"That was pretty cool for me. Obviously I want to keep that number going higher and see what can happen."
Williams was in complete control against Larsson, breaking the Swede's serve four times and hitting 24 winners to her opponent's five.
The American, however, believes there is still more to come.
"I feel okay," Williams said. "Obviously I don't feel like I'm Serena out there yet, but hopefully she'll come around the second week."
Williams pulled out of a tournament in Cincinnati last week with a shoulder injury, but the issue appears to be clearing up.
Her first serve averaged 105 miles per hour against Larsson and found its mark 60 per cent of the time.
"My shoulder definitely feels solid," Williams said. "I'm doing a lot of work on it so I can keep it in this position."
Also into the last 16 is Serena's older sister Venus, who is due to meet her sibling in the semi-finals and, at 36, is the oldest player in the draw.
Venus eased past Germany's Laura Siegemund 6-1 6-2 and will now play 10th seed Karolina Pliskova.
The seven-time major champion has enjoyed something of a renaissance over the last 12 months, backing up her run to the quarter-finals in New York last year by making the last four at Wimbledon this summer.
"It's just a lot of willpower. That's really what it is," Venus said. "I started to feel better more consistently this year, so I'm always trying to find things to help me feel my best.
"But even if I'm not feeling great, I still manage to get a good fight in out there."
Fifth seed Simona Halep is also through to the fourth round after beating Hungary's Timea Babos, while fourth seed Agnieszka Radwanska overcame France's Caroline Garcia.
