Teacher: Given a document, an entity and its sentiment towards the entity, verify if it is the correct sentiment towards the entity. Answer should be yes or no. Note that URLs in the text have been replaced with [Link].
Teacher: Now, understand the problem? If you are still confused, see the following example:
Verify if the sentiment of the following document towards the entity Bill Clinton is Positive . Bill Clinton knows how to win friends and influence people. The former president is a master of reinvention — and the same talents that guided him into office have propelled him, more recently, into the stratosphere of Internet stardom.
Solution: yes
Reason: Here the author of the document praises Bill for this ability to win friends. Hence the sentiment should be Positive and the answer is yes.

Now, solve this instance: Verify if the sentiment of the following document towards the entity Roger Federer is Positive . Roger Federer dominated Andy Murray on Tuesday at the ATP World Tour Finals and stretched his record to 2-0 at the season-ending event by winning 6-4  6-2.
 Federer looked unstoppable on the court at the O2 Arena  losing only eight points on his serve in the match -- three in the first set and five in the second.
 "He came out and made some mistakes. Maybe it was due to my good play " Federer said of Murray  who made 26 unforced errors. "I played tough and solid from start to finish. That seemed to be enough today."
 Later Tuesday  Robin Soderling was to face David Ferrer in the other Group B match. Federer can advance to the semifinals depending on the late result.
 Federer has won the season-ending event for the top eight players in the world four times  and he can certainly add to that if he keeps playing like he did Tuesday.
 Murray  however  dropped to 1-1 and will have to improve if he is to reach the semifinals. He will face Ferrer in his final match Thursday while Soderling takes on Federer.
 final match Thursday while Soderling takes on Federer.
 Murray struggled from the start Tuesday  forced to save a break point in the opening game. And it was his serve that was letting him down most of the way  landing only 44 percent of the first serves. That allowed Federer to take advantage of the much slower second serve.
 Federer earned his first break in the third game of the first set  winning all four points played. He then won his next three service games at love.
 In the second set  Murray saved two break points in the opening game  but Federer stayed alive through four deuces to earn a third break point  which he converted with a forehand that hit the top of the tape and zipped past Murray.
 After holding at love yet again  Federer broke again to make it 3-0 and soon led 4-0.
 "I tried to play quite aggressive. You're not going to hit winners every single time you go on the court " said Murray  who is 8-6 overall against Federer. "Today I made more mistakes than normal."
Student:
yes