Williams will face Canadian Bianca Andreescu for the US Open title as the American sets herself up for another attempt to clinch a record-equaling 24th Grand Slam singles title.
Simona Halep won the Wimbledon final after two sets (6:2, 6:2) against Serena Williams. It is her second Grand Slam victory and the first in Wimbledon.
Serena Williams was relentless in her first appearance at Melbourne Park since winning the title in 2017, losing only five points in the opening set on her way to a 6-0, 6-2 win over Tatjana Maria in just 49 minutes.
Six-time champion Serena Williams roars into the final with an emphatic 6-3, 6-0 over Anastasija Sevastova, seeking to add to her 23 Grand Slam titles for the first time since the birth of her daughter Olympia.
Serena Williams said her win over sister Venus at the US Open on Friday was more meaningful than those she scored when they were up-and-coming teenagers because the pair realises they only have a limited number of years left in the game.
But while the world number one cruised through her quarterfinal clash in straight sets, she made it very clear that she was unhappy playing three matches in two days.
The five-time champion Venus Williams was beaten by Dutch Kiki Bertens in the third round, being the second person from last year's finalists to lose before the fourth round.
Defending champion Roger Federer defeats Lukas Lacko while sisters Serena Williams and Venus Williams advance to the next round. Meanwhile, world number two Caroline Wozniacki suffers shock defeat against Ekaterina Makarova.
Roger Federer and Serena Williams return to the tournament but hip injury forces Swiss star Andy Murray to withdraw from the championship.
Venus Williams upended defending champion Johanna Konta 5-7 6-1 6-2 on Monday to reach the Miami Open quarter-finals while a dominant Victoria Azarenka also advanced with a straightforward win over Agnieszka Radwanska.
The match started as a cagey affair until it reached 3-3 in the opening set before Halep’s game unraveled as she coughed up a litany of errors, paving the way for Osaka to reel off the next nine games without much resistance.
Despite the loss in the 29th career meeting between the two sisters, Serena, who is still shaking off the rust after a long layoff, leads their career series 17-12.
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