DUBAI: Wimbledon champion Petra Kvitova’s hope of challenging for the world No. 1 spot took another blow when she was forced to retire for a second tournament in a row.

The fierce-hitting left-hander from the Czech republic has decided she had not recovered sufficiently from a virus to compete at the Dubai Open, starting here Monday.

Kvitova also withdrew from last week’s Qatar Open in Doha, and is likely remain in Prague until shortly before she competes again, probably at Indian Wells in the first week in March.

“I love playing in Dubai and am so disappointed to not be able to get on the plane and go and play for the fans and those amazing crowds,” said Kvitova, who added that she would “definitely be back for many years to come.”

Kvitova reached the semifinals of the Australian Open in Melbourne last month, and it was after competing again, only a few days later, in a Fed Cup match against Germany, that she started to feel unwell.

It means that there will be a delay in the next episode of her burgeoning rivalry with world No. 1 Victoria Azarenka, whom she has beaten in their last four meetings, and whom she had been seeded to meet in Saturday’s final.

It also brings a pause to a tremendous rise which saw Kvitova move from world No. 34 at the start of 2011 to within striking distance of the pinnacle, winning six tournaments during the year.

However Kvitova will not fall from the world No. 3 position, because she has fewer ranking points to defend than Caroline Wozniacki, the runner-up in Doha last year and the defending champion in Dubai this week.

Indeed Wozniacki, world No.1 until the start of this month and now at No. 4, is at risk of falling further unless she does well again this week.

With more than 1,200 points to defend over the two weeks in the Middle East, Wozniacki may find that Samantha Stosur, the U.S. Open champion from Australia, is looking to nudge her down to No. 5.

Meanwhile the Women’s Tennis Association announced a three-year extension to a multi-million dollar global sponsorship from Dubai Duty Free, which means the relationship will have lasted more than a decade.

“It helps keep tennis the No. 1 women’s sport in the world,” claimed Stacey Allaster, the WTA’s chief executive.