NEW YORK — Serena Williams hardly broke a sweat Monday, but she did break a record.

Williams moved into the U.S. Open semifinals with a 6-2, 6-3 win over Yaroslava Shvedova on Ashe Stadium Court.

The victory was number 308 in Grand Slams, breaking a tie for wins in tennis’ biggest events with Roger Federer. Federer skipped the Open this year to rehab an ailing knee.

“I just think winning 308 matches in general is pretty awesome. For that to be in a Grand Slam is pretty cool,” Williams said. “It’s a huge number. I think it’s very significant actually. I think it’s something that just really talks about the length of my career, in particular. I’ve been playing for a really long time, but also given that consistency up there. That’s something that I’m really proud of.”

Williams has been nursing a sore right shoulder since the start of the summer, but it doesn’t seem to be impacting her blunderbuss serve. She served 11 aces Monday and leads the women’s field with 42 in four matches.

“I don’t think I really served in the summer until I got here to New York, so … It was a really tough summer for me,” she said. “Maybe that’s the key.”

Her opponent in the quarterfinals will be Simona Halep, who defeated Carla Suarez-Navarro 6-2, 7-5. Williams has 22 Grand Slams, Halep is still looking for her first. She says because she’s playing Williams, the pressure is off.

“I don’t have to be afraid or to have emotions because I have nothing to lose,” Halep said. It’s just a huge challenge for me.”

“I just think with everyone I play, they play a step up and above their ranking,” Williams said. “I think that’s the beauty, one of the reasons I’m able to hang. Everyone I’m playing is playing like they’re No. 1.”