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].
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Question: And with a mangled racket and plenty of kicking and screaming  including a couple of arguments with the chair umpire  then a postmatch parting shot at a line judge Safin called "a little bit too blind."
 Safin used to rant about disliking tennis on grass  and he once complained about the high price and low quality of food at the players' restaurant at the All England Club. Well  he doesn't have to worry about any of that again after bowing out in his final Wimbledon with a 6-2  3-6  7-6 (4)  6-4 loss to Levine.
 After confirming this would be his last appearance at the grass-court Grand Slam tournament -- Safin has vowed to retire at season's end -- he was asked how he feels about being done with Wimbledon.
 He's a former No. 1 player who won the 2000 U.S. Open and 2005 Australian Open  but a series of injuries slowed him recently. Still  Safin came to Wimbledon ranked 24th and seeded 14th  and had to be considered quite a favorite against Levine  who never had defeated anyone ranked better than 67th.
Safin has vowed to retire at season's end -- he was asked how he feels about being done with Wimbledon.
 He's a former No. 1 player who won the 2000 U.S. Open and 2005 Australian Open  but a series of injuries slowed him recently. Still  Safin came to Wimbledon ranked 24th and seeded 14th  and had to be considered quite a favorite against Levine  who never had defeated anyone ranked better than 67th.
 "He's an amazing player  and I'm still kind of feeling weird right now that I just beat Safin  because I've always watched him play on TV " said Levine  who turned pro in 2007. "I just kind of went out there with nothing to lose and played some good tennis."
 Levine was a teen when Safin burst onto the scene as a brash  big-hitting 20-year-old who knocked off Sampras to win the U.S. Open.
 "I really had to ... focus on playing against the ball and not worrying about  'Oh  wow  I'm playing against Marat Safin on the other side of the court '" Levine said. "Because then things could have gotten a lot more interesting."
 As is his wont  Safin made things interesting enough. In the early going  he broke his racket by spiking it on the court.
 Leading 4-3 in the third-set tiebreaker  Safin hit a shot near a line that was ruled out. Afterward  Safin said: "Thanks for the guy who made the call. I want to say hello to him. Too bad that he was a little bit too blind."
 In the fourth set  Safin told the chair umpire he could check for chalk on the ball to confirm a call. Rebuffed  Safin added: "So all players are stupid?"
 Safin reached at least the semifinals at all four majors  including at Wimbledon last year  but he has been criticized for not living up to the potential stored in his 6-foot-4 (1.93-meter) frame -- about 7 inches (18 centimeters) taller than Levine.
 "In the history of tennis  everybody's an underachiever " Safin said. "Agassi should have been winning  I don't know  15 Grand Slams. Sampras should have been winning 20 Grand Slams. Federer should be winning -- already should have 25."
 "I should probably have (won) a couple of more " he said  "but I'm pretty satisfied with what I did."

Answer: Marat Safin


Question: Hide caption Diane Askwyth leads cheers as protesters make their way to  Sam Boyd Stadium  for the Women's March "Power to the Polls" voter registration tour launch on Sunday  in Las Vegas  Nev. Previous Next Sam Morris/Getty Images
Hide caption Protesters carry signs as they make their way to  Sam Boyd Stadium  on Sunday. Previous Next Sam Morris/Getty Images
Hide caption An attendee holds a sign during the Women's March "Power to the Polls" voter registration tour launch at Sam Boyd Stadium in Las Vegas. Previous Next Ethan Miller/Getty Images
Sunday's event was not a march  organizers say  but a rally  beginning at 10 a.m. local time inside  the Sam Boyd Stadium in Las Vegas . Officials tell Fadel that although the venue can hold 40 000  they expected roughly 17 000. The organizers say they are less concerned with crowd size than with spreading their message. Nearly two hours after doors opened  Fadel estimated that thousands â many in the movement's trademark pussyhats â had filed into  the stadium  under clear skies.

Answer: Sam Boyd


Question: Russian election officials on Monday formally barred  Russian opposition leader Alexei Navalny  from running for president  prompting calls from  him  for a boycott of next year's vote.
 Navalny  is implicitly barred from running for office because of a conviction in a fraud case which has been viewed as political retribution.  He  could have run if  he  was given a special dispensation or if  his  conviction was cancelled.
 Incumbent Vladimir Putin  is set to easily win a fourth term in office in the March 18 election  with  his  approval ratings topping 80%.
 Putin  foe clears first step in bid for Russian presidency
Over the past year   Navalny  has mounted a grassroots campaign which reached out to the most remote corners of  Putin 's heartland.
 Navalny   41  is the most serious challenger that  Putin  has faced in all  his  years in power  and the court cases against  him  have been widely seen as a tool to keep  him  from running for office.
In a pre-recorded video message that was released minutes after the Election Commission handed down the decision  Navalny called on  his  supporters to boycott the vote.
"The procedure that we're invited to take part is not an election "  he  said. "Only Putin and the candidates  he  has hand-picked are taking part in it."
Central Election Commission chief Ella Pamfilova told  Navalny  ahead of its vote to bar him that "maybe we would be interested if you were running " but said the conviction doesn't allow the commission to put him on the ballot.
Speaking before the vote   Navalny  told the commission that  their  decision to bar him would be a vote "not against me  but against 16 000 people who have nominated me  against 200 000 volunteers who have been canvassing for me."
The involvement of Ksenia Sobchak  a 36-year-old star TV host  could raise public interest in the race. While Sobchak has denied colluding with the Kremlin  she could attract some of  Navalny 's supporters and help boost attendance.
Sobchak criticized  Navalny 's call for boycotting the vote  saying Monday that the "election is the only way to change something  and boycotting them is inefficient and harmful."

Answer:
Alexei Navalny