Sierra, who had already checked out of her accommodation, learned only at lunchtime on Monday that Belgium's Greet Minnen had pulled out of the tournament and that she had been selected in the draw for a lucky loser spot in the main draw.
Defending champion Caroline Wozniacki and former winner Maria Sharapova cruised into the third round of the Indian Wells WTA tournament with 6-2, 6-0 victories on Saturday.
Australian Open winners Leander Paes and Radek Stepanek saw off stiff resistance from Juan Monaco and Kei Nishikori to advance to the quarter-finals of the ATP Indian Wells Masters. The seventh-seeded Indo-Czech pair beat their unseeded opponents 7-6(5), 6-4 in a second round match.
The second seeded Indo-Russian pair needed just over an hour to get the better of the Argentine team of Gisela Dulko and Paola Suof 6-2, 6-3.
Sania Mirza and Elena Vesnina recovered from a second-set lapse against Timea Bacsinszky and Alberta Brianti to advance to the doubles quarter-finals of the Indian Wells WTA Premier event.
Images from day two of the Australian Open 2012 tennis tournament in Melbourne, on Tuesday.
India's Sania Mirza bowed out of the US Open with a second round defeat at the hands of Russia's Anastasia Pavlyuchenkova on Wednesday. The Russian, seeded 20th, won 6-2, 6-4 and faces Argentine Gisela Dulko in the third round on Friday.
Sania Mirza and and her partner Elena Vesnina shocked top seeds Gisela Dulko and Flavia Pennetta 6-0, 7-5 to reach the women's doubles semi-finals in the French Open, on Monday.
Sania Mirza, on Sunday, reached her first ever French Open women's doubles quarter-finals with partner Elena Vesnina but Mahesh Bhuapthi's campaign ended after suffering a second round defeat in the mixed doubles along with Jie Zheng.
Last year's runner-up Samantha Stosur was knocked out in the French Open third round after a 6-4, 1-6, 6-3 defeat by Argentina's Gisela Dulko on Friday.
Argentine Gisela Dulko and Italy's Flavia Pennetta beat Eastern Europeans Victoria Azarenka and Maria Kirilenko 2-6, 7-5, 6-1 to win the Australian Open women's doubles titles on Friday.
Sania Mirza's campaign in the Australian Open ended on Wednesday when she and her Czech partner Renata Voracova crashed out of the women's doubles, losing in straight sets to top seeds Gisela Dulko and Flavia Pennetta in the opening round in Melbourne. Argentina's Dulko, who is the World No 1 doubles players and her World No 2 Italian partner Pennetta, outplayed the Indo-Czech duo, winning the contest 6-4, 6-1 in just over 60 minutes.
Tennis star Aisamul Haq has become the first from Pakistan to reach the semi-finals of any Grand Slam event.
Former champion Lindsay Davenport, who has been struggling with a right knee injury, pulled out of Wimbledon on Thursday.
Two years ago, Ana Ivanovic's squeaky shoes carried her all the way to a women's final against Maria Sharapova at the Australia Open.
Sania Mirza crashed out of the women's doubles after losing a thriller but Mahesh Bhupathi advanced to the second round of the mixed doubles at the US Open in New York. Fourteenth seeds Sania and Francesca Schiavone of Italy made a smart recovery from a set down but failed to deliver at crucial points in the decider to lose 2-6, 6-1, 5-7 against the unseeded duo of Gisela Dulko of Argentina and Shahar Peer of Israel in a 125-minute second round match.
Former champion Maria Sharapova had her lack of match practice exposed by unseeded Argentine Gisela Dulko who claimed a nailbiting 6-2, 3-6, 6-4 victory in the second round at Wimbledon on Wednesday.
Former champion Maria Sharapova had her lack of match practice exposed by unseeded Argentine Gisela Dulko who claimed a nailbiting 6-2, 3-6, 6-4 victory in the second round at Wimbledon on Wednesday.
Sania Mirza and her partner Chuang Chia-jung of Taiwan rallied to stun eighth seeds Maria Kirilenko and Flavia Pennetta in a gruelling three-setter for a place in the women's doubles quarterfinal of the USD 4.5 million Miami Masters.
World number three Jelena Jankovic, eliminated in the second round for the second tournament in a row, said she had lost her confidence after a poor start to the season.
Defending champion Ana Ivanovic beat Argentina's Gisela Dulko 6-3, 6-3 to reach the fourth round of the WTA event in Indian Wells on Monday. The Serbian fifth seed was not totally convincing but did enough to set up a clash with Italian 12th seed Flavia Pennetta.
On a mixed day for the Indians, Mahesh Bhupathi advanced to the men's doubles second round but Sania Mirza crashed out of the women's doubles event at the US $ 4.5 million BNP Paribas Open tennis tournament in Indian Wells. Sania and her partner Chia-Jung Chuang of Taipei went down 1-6, 4-6 to the Argentine-Israeli team of Gisela Dulko and Shahar Peer in the opening round.
Top seeds Serbia shrugged off Jelena Jankovic's ongoing injury to clinch a Hopman Cup final showdown with United States.
The 47-year-old former champion was whipped by Gisela Dulko of Argentina in the first round at the French Open.
British qualifier Elena Baltacha "fought her heart out" to record the biggest win of her career when she upset seventh seed Li Na of China at the Indian Wells WTA tournament on Friday. Former world number one Justine Henin was also a shock loser, beaten 6-2, 1-6, 6-4 by Argentina's Gisela Dulko.
The Indian ace was beaten by Argentine Gisela Dulko in the semi-finals of the WTA Tour event in Pattaya.
Russian second seed Anastasia Myskina made a disappointing start to her 2007 campaign on Monday, falling at the first hurdle in the Auckland Classic to Argentina's Gisela Dulko
Seven top 20 ranked players have already withdrawn from the event.
They were beaten in straight sets by Italy's Maria Elena Camerin and Gisela Dulko of Argentina.
They were beaten by the top-seeded pair of Maria Elena Camerin and Gisela Dulko.
The Belgian will face Elena Dementieva while the Swiss ace will take on Paradorn Srichaphan in ther semi-finals of the Pacific Life Open.
After just four days the Asian challenge is all but over at the Grand Slam of Asia/Pacific
The Indian ace was trailing 5-7 against Meng Yuan of China when she pulled out due to lower back strain.
The 47-year-old lost to Claudine Schaul of Luxembourg 4-6, 6-1, 6-3 in the first round of the tournament after getting a wild card.
Mirza teamed up with Russian Anna Chakvetadze to beat Kristina Brandi of Puerto Rico and Nana Miyagi of Japan.
The Indian ace, who lost in the first round, said she is looking forward to playing in the doubles at the French Open with Anna Chakvetadze of Russia.
The Indian ace was beaten by 30th seed Gisela Dulko in the first round at the French Open.