instruction:
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].
question:
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."
answer:
Sam Querrey


question:
With the Nats and their latest new manager back in the news  longtime play-by-play voice  Charlie Slowes  had occasion this week to reminisce about the history of Nationals managers. Which led  him  to one of  his  favorite stories about a Nats manager  one I had never heard but immediately loved.
“I guess he’d just got into his car  he’s listening to the radio or something ”  Slowes  went on. “And he rolls his window down — and he was still in full uniform! He goes  ‘I’ve got to be back so early tomorrow  why even bother changing?’
“So my thought was — as he rolls his window up and he pulls away — he’s living in an apartment building in D.C. ”  Slowes  said. “And I’m just thinking  he’s got to go in the garage and go up to his apartment. He’s doing that in full uniform? If you lived in the apartment  you’d go  ‘Hey  who’s the guy in the Frank Robinson uniform?’ ”
“I couldn’t believe that he did it  and to this day nobody else knows that story ”  Slowes  said. “I’ve told  it  to a couple people  but nobody else saw  it   so  it ’s not believable to anybody else.” But  Slowes  called  it  “one of my great memories” from  his  time with the Nats.
Meanwhile   Slowes  — who also has a history with the Tampa Bay Rays — has known new skipper Dave Martinez for 20 years  and has spoken with him frequently about his desire to get a big league managerial job.
“I’ve talked to him every year ”  Slowes  said. “I talked to him during the [Nats-Cubs] playoff series. Each year I’d see him back in Florida — because we live near each other — and he’s say  ‘I’m so ready  I’m ready to have my own team  I’m ready to manage  that’s what I want to do.’ So I knew that he interviewed when Matt Williams was hired; he was the runner-up. I knew he was considered after Matt Williams  but they decided to go with the experienced manager. I knew he interviewed for other jobs.”
answer:
Charlie Slowes


question:
The Walking Dead returned with a bang for its eighth season Sunday night  as Alexandria  the Hilltop and the Kingdom escalated the conflict with Negan and the Saviors to all-out war. Before leading the attack on the Sanctuary   Rick  delivered one of  his  classic impassioned speeches about the meaning of the group's mission.
"We found each other and that bigger world is ours by right "  he  said. "And if we've come together  all of us  it's that much more true. It's ours by right. Any person who would live in peace and fairness  who would find common ground  they're right too. But those who use and take and kill to carve out the world and make it theirs alone  we end them. We don't celebrate it. We don't have shame about it either. There's only one person who has to die and I will kill him  myself . I will."
However  there were also a series of cryptic flash-forwards interspersed with the present-day battle scenes that featured a much older  Rick  waking up in  his  home with Michonne  Carl and Judith followed by a wildly distressed  Rick  alone in an unclear location. "My mercy prevails over my wrath " the tearful  Rick  whispers near the end of the episode.
The old-man Rick sequence was teased in the trailer for the season that premiered at San Diego Comic-Con and led fans to speculate that the show intended to mirror the time-jump that takes place in the Walking Dead comic books following the war with Negan. But judging by the setup of the premiere  it seems more likely that it is only Rick's vision of what could have been if he and his family had been able to live in peace.
answer:

Rick