Azarenka ousted at China Open
Andrea Petkovic brought an end to Victoria Azarenka's China Open title defence with a shock first-round win in Beijing.
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World number two Azarenka lost to Venus Williams in Tokyo last week and her poor form continued on Monday as she was beaten 6-4 2-6 6-4.
Petkovic, who has battled injury over the last two years, looked on course for a straight sets win after going a break up in the second, but the two-time grand slam winner fought back to take the match to a decider.
The third set was tightly poised at 4-4 before Germany's Petkovic broke to love and then served out for the match.
"It was an awful match and a very bad performance from me, so there's not much to say about it," a downbeat Azarenka told a press conference afterwards.
"It happens once, twice a year to every player, and it happened to me today."
Petkovic, 26, will now play Svetlana Kuznetsova, who beat Hsieh Su-Wei 6-1 6-1.
Fifth seed Sara Errani beat Japanese qualifier Misaki Doi 6-3 6-2 while another seed - Ana Ivanovic - defeated Italy's Flavia Penetta.
It was not so easy for eighth seed Jelena Jankovic, who came from one set down to beat Russia's Anastasia Pavlyuchenkova 1-6 6-4 6-0.
Canada's Eugenie Bouchard beat Magdalena Rybarikova to set up a second-round clash with American rising star Sloane Stephens.
In the men's draw, Lleyton Hewitt beat seventh seed and fellow veteran Tommy Haas 7-6 (8-6) 6-3.
Hewitt's fellow Australian Bernard Tomic overcame home favourite Ze Zhang in straight sets, but Grigor Dimitrov suffered a shock 6-4 6-2 exit to Roberto Bautista Agut.
Germany's Philipp Kohlschreiber beat Albert Montanes 7-5 1-6 7-6 (7/4) to set up a possible second-round meeting with Rafael Nadal.