Sania Mirza's singles campaign at the Wimbledon championships ended with a second round loss to Sorana Cirstea.

Sania lost 4-6 4-6 to Romanian 28th seed Sorana Cirstea on Wednesday.

Unforced errors proved costly for the Indian in the one-hour-22-minute contest as she yet again failed to move beyond the second round.

Sania played mostly from the baseline but struggled to keep her booming strokes within the court.

The inability to win points on serve added to the woes of the unseeded Indian against an opponent ranked as high as 27th in the world.

Sania had the first opportunity to get a break but Cirstea denied her friend the favour.

Sania then committed a double fault in the fifth game to hand the Romanian a break chance. Sania saved four breakpoints in that game but another double fault undid all the good work.

Meanwhile, the Indo-Bahamian pair came through 6-7 (4), 6-4, 7-5, 7-5 in a thrilling battle in which the Indo-South African duo pushed the fourth seeds to the limits before going down in three hours and 15 minutes.

In the opening set, Somdev and Anderson twice overcame a 1-4 deficit, second time in the tie-breaker, to go one up.

But the Indo-Bahamian pair used all its experience to survive the fight, winning the next three sets.

Bhupathi and Knowles broke Somdev and Anderson in the second game of the match to take a 3-1 lead.

The qualifiers got a chance to break their superior rivals in the fifth game but Bhupathi and Knowles punctured their hopes.

However, Somdev and Anderson were in no mood to surrender and saved a breakpoint each in the sixth and eighth games and squeezed in a break in the seventh to make it 4-4.

The third set also saw an intense fight as first 10 games went with serve and both the pairs saved a breakpoint each.

Bhupathi and Knowles converted their third chance in the 11th game and held the next one to take the lead.

Somdev and Anderson dropped their serve in the first game of the fourth set but made a good comeback, riding on breaks in the fourth and sixth games, which gave them a 4-2 lead.

However, Bhupathi and Knowles broke them twice -- seventh and 11th games -- before serving out the match.