Martina Trevisan, who reached the French Open quarterfinals two years ago as a qualifier, beat Leylah Fernandez 6-2, 6-7 (3), 6-3 to advance to the semis.
In a gruelling 2hour 41min battle, French Open champion Simona Halep prevailed 7-6 (8/6), 3-6, 6-4 over Sloane Stephens in a repeat of the duo's meeting in the final of Roland Garros earlier this year.
US Open winner Sloane Stephens and world number one Simona Halep cruised into the final to set up a rematch of the French Open final.
Romanian and world number one Simona Halep broke Spaniard Garbine Muguruza's serve six times in a ruthless display to set up Saturday's final against US Open champion Sloane Stephens.
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.
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.
Sloane Stephens beat Madison Keys 6-3 6-0 in an all American US Open final to claim her maiden grand slam title.
Americans Sloane Stephens and Madison Keys, both struggling with serious injuries, advance to their first Grand Slam final at the US Open.
The 37-year-old Williams might be in the twilight of a sparkling career, but given the opportunity she can still shine.
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