TASK DEFINITION: Given a document, find the main entity about whom the author is writing. Write the full name if mentioned in the text. Note that URLs in the text have been replaced with [Link].
PROBLEM: Sam Querrey gave the United States a winning start in its bid to reach Saturday's final at the World Team Cup.
 Querrey beat Jan Hajek 6-3  7-5 on Thursday to put the U.S. 1-0 up against the Czech Republic in the Red Group and remain unbeaten in his three singles this week.
 "So far so good " said Querrey. "I thought today was the best I played out of the three matches. So I'm pretty excited."
 Hajek claimed the first break  when Querrey ended a long rally with a forehand error  to go 3-1 up but the American player responded by winning the next five games in a row to take the opening set.
 Both players saved a break point late in the second set before Querrey broke at 6-5  converting his third match point.
 "I've been working this week to try and hit my forehand a little bigger. I felt I did that today " said Querrey. "I felt pretty much anytime I got a forehand  I was able to take control of the point."
 Querrey said his win takes the pressure off the U.S. ahead of Friday's matches.
 "A little bit  yes. I think John (Isner) can go out there and play a little more freely  which is a good thing " Querrey said. "When we have the lead  you can swing away a little bit more than if we were 1-0 down.
 "Then  the Bryan brothers  we expect them to win every match. Hopefully  they are going to do that again."

SOLUTION: Sam Querrey

PROBLEM: The leader of India's main opposition Congress party   Sonia Gandhi   has retired from  her  post  the party confirmed on Thursday.
 Her  son   Rahul Gandhi   has been elected unopposed as the new president and will officially take charge on Saturday.
 Mrs Gandhi   71  has been the party president since 1998.  She  was elected to parliament in 1999.
 She  is  however  not retiring from politics and will continue as a member of parliament  the party said.
 Mrs Gandhi  entered politics in 1994   three years after after  her  husband  former Prime Minister Rajiv Gandhi  was assassinated.
 Her  power derived from being the head of the Nehru-Gandhi dynasty  which has led the Congress party and has ruled India for most of the years since it became an independent nation in 1947.
After distancing  herself  from politics following  her  husband's death   Mrs Gandhi  was initially seen as a reluctant and almost reclusive politician.
Under  her  leadership  the party turned in its second-worst performance since independence in the 1999 elections  but won the general elections in 2004 and 2009.
Image copyright Getty Images Image caption  Rahul Gandhi  has been named the new Congress party president
Mrs Gandhi  an Italian-born Catholic  would have been the first foreigner to become Indian prime minister had  she  not surprised everyone by turning down the post after  her  general election success in 2004. Yet  many considered  her  the de facto head of the Congress government.
In recent years  Mrs Gandhi  has faced health issues. In 2011   she  had surgery in the US for an undisclosed medical condition and in 2013  she  was taken to hospital from parliament after falling ill.

SOLUTION: Sonia Gandhi

PROBLEM: Chipotle's CFO is set to make $1 million if he stays at Chipotle for one year after the chain replaces founder Steve Ells with a new CEO.
On Friday  Chipotle reported in an SEC filing that it had entered into retention agreements with certain executives to convince them to stay at the chain as it searches for a replacement for  founder Steve Ells .
CMO Mark Crumpacker is set to receive $600 000 on the one-year anniversary of the appointment of  Ells'  replacement. Crumpacker had previously taken a three-month leave of absence in 2016 after being arrested on charges of cocaine possession.
Chipotle announced in November that  Ells  plans to step down as it begins its hunt for a new CEO. According to Chipotle  the company is looking for "a new leader with demonstrated turnaround expertise to help address the challenges facing the company  improve execution  build customer trust  and drive sales."

SOLUTION:
Steve Ells