Chopra, 26, was forced off after 30 minutes after a heavy challenge from Doncaster's Wayne Thomas.
Cardiff council leader Heather Joyce has survived a leadership challenge from within her party.
BBC: Cardiff council leader Heather Joyce survives challenge
But PayPal faces a wider challenge from the introduction of NFC chips into recent smartphones.
That might be an excuse for us to get a challenge from somebody in a primary.
Glaxo was defending its Paxil, an antidepressant, against a challenge from generic drug maker Apotex .
Araafa, fourth in the Newmarket classic, fought off a late challenge from the 4-7 favourite.
BBC: SPORT | Other Sport... | Horse Racing | Araafa upsets odds for Irish win
Eyeing the challenge from HP, IBM's software chief, Steven Mills, throws down the gauntlet.
Anderson was stretchered off at the final whistle after an innocuous looking challenge from Giles Barnes.
Ramires tumbled under challenge from Evra while Torres went down as he tangled with Antonio Valencia.
The company's products are facing a growing challenge from Samsung and other makers of Android-based devices.
The short meets sugar challenge from lunch and the long-acting meets the sugar from dinner.
The challenge from a marketing standpoint is convincing its customers that the network has been fixed.
It faces a challenge from breakaway pro-Europeans, who speak openly of displacing Mr Hague as leader.
However, liberals face a violent challenge from fundamentalist forces which have grown more radical over the years.
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That mentality could spell trouble for Nye, who is facing a stiff challenge from political newcomer Rigell.
But in the fourth spot, Republican conference chairman John Boehner of Ohio faces a challenge from J.
Five forces are facing a legal challenge from officers who claim they were subject to age discrimination.
Mugabe survived a hotly contested presidential challenge from Tsvangirai in 2002, amid widespread accusations of vote rigging.
Mr Kaczynski had been facing a tough challenge from Bronislaw Komorowski, a close ally of Mr Tusk.
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Stock exchanges face a challenge from electronic rivals doing what they do, but faster and more cheaply.
Ms Marwick, 57, saw off a challenge from party colleague Christine Grahame and former Labour minister Hugh Henry.
Its business model is under challenge from data commissioners in Europe, where personal details are protected by law.
In the late 1990s, Mr Howard adroitly saw off a xenophobic challenge from Pauline Hanson's One Nation party.
Hodgson had been fuming about the injury after the challenge from Belorukov, for which the Russian was booked.
City officials said they expect a legal challenge from McDonald's, which declined to comment on possible legal action.
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Arlen Specter faces a spirited primary challenge from U.S. Rep. Pat Toomey, who says Specter is too liberal.
The Tories also face a challenge from the Liberal Democrats, who announce their new leader on December 17th.
ECONOMIST: The Conservatives are doing well, but not well enough
Likewise, in New Jersey seven-term Democratic congressman Rush Holt is facing a tough challenge from Republican Scott Sipprelle.
And in the Tri Nations, Australia's Stirling Mortlock was injured by a challenge from South Africa's Bakkies Botha.
Mr Madrazo, the party's former president, faces a strong challenge from Arturo Montiel, the ex-governor of Mexico state.
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