Former French Open finalist Sara Errani has failed a doping test for a hormone that can hide the presence of the male hormone testosterone, two Italian newspapers reported on Monday.
Sania Mirza and Barbora Strycova could next face the team of Martina Hingis and Chan Yung-jan in the Indian Wells women's doubles quarterfinals.
Sara Errani crushed Barbora Strycova 6-0, 6-2 in the final of the Dubai Tennis Championships to win her ninth career WTA title.
Sara Errani was a 2013 finalist at the Dubai Tennis Championships, losing to Petra Kvitova of Czech Republic.
Italy's Sara Errani had to fight it out against Madison Brengle 4-6, 6-1, 6-4 to set up semi-final clash against Caroline Garcia.
Simona Halep will play for her 12th career title and fourth of the year in Sunday's championship match against against Swiss teen Belinda Bencic, who stunned world number one Serena Williams in the other semifinal of the Rogers Cup.
While David Ferrer beat Italian Fabio Fognini 6-2, 6-3, Sara Errani scored a 7-6 (7/2), 6-1 win in the women's final over Slovakian sixth seed Anna Karolina Schmiedlova.
Caroline Wozniacki defeated Sara Errani to storm into her first Grand Slam semifinal in three years.
Sania Mirza and Cara Black lost 7-6, 6-3 against top seeds Sara Errani and Roberta Vinci, who won their first Rogers Cup title.
The second-seeded Sara Errani and Roberta Vinci beat 14th-seeded Timea Babos of Hungary and Kristina Mladenovic of France 6-1, 6-3 in the final.
World number one Williams, a 16-time Grand Slam winner seeking her fifth US Open crown and her ninth title of the year, dispatched 18th seed Carla Suarez Navarro 6-0, 6-0, in 52 minutes on the Spaniard's 25th birthday.
The second-seeded Vinci was broken in the first game, but she broke back twice before serving out the opening set.
No. 1-seeded Errani, who won this tournament in 2008 and 2012, recovered from 3-1 down in the second set to beat fourth-seeded Klara Zakopalova of the Czech Republic 6-4, 6-4.
Errani will next face seventh-seeded Silvia Soler-Espinosa of Spain, who advanced after Croatian opponent Mirjana Lucic-Baroni retired while trailing 6-2, 1-0.
Kvitova, 2011 champion, is the only WTA player born in the 1990s to win a Grand Slam tournament.
The victory was also Serena's 75th in her last 78 matches, a run that stretches back to her shock first round departure at Roland Garros in 2012
The world number one, who will claim her 51st WTA title if she triumphs this weekend, will meet the winner of the quarter-final between Jelena Jankovic and Simona Halep.
Pavlyuchenkova has been working with Hingis officially for just a few weeks and the analytic game style and fighting determination of Switzerland's five-time grand slam champion may be rubbing off on the 21-year-old right-hander.