Williams was immediately in overwhelming form, firing winners at will to hold in the opening game, then quickly breaking Wang for a 2-0 lead. The American swiftly broke again for 4-0 while Wang finally held serve in the sixth game to save face.

But Williams continued to blast ruthless winners on both sides and took the first set at 6-1. After that, Williams never looked back en route to the bagel in the second set.

"I think she's really a great player. Yeah, just great. I don't know what to say," 27-year-old Wang said. "Her power, I cannot handle it. Just too much for me. And she gave me a lot of pressure. So it's not easy to play against her."

"I need to build my muscle, try to be more powerful. Just need to do more on everything.

"I think I did a really good job in the past two weeks. I lost the match, but I want to take positives from the tournament. I just talked to my coach. We are very positive with the future," Wang added.

Williams will now take on fifth seed Elina Svitolina of Ukraine in a semifinal battle between the two highest-seeded players remaining in the draw. Svitolina ousted Johanna Konta of Britain earlier on Tuesday.

Williams leads their head-to-head record 4-1, but Svitolina did win their most recent meeting, which was a shock upset at the 2016 Olympics in Rio de Janeiro when Williams was world number one.

"Svitolina is obviously a fighter," Williams said. "She gets a lot of balls back. She doesn't make a lot of mistakes. She's one of those players that does everything really well. So I have to do everything well, too."

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