LONDON -- Novak Djokovic was embroiled in a tetchy exchange with reporters after defeating Dominic Thiem in his Tour Finals opener.The Serb -- who was overtaken as world No. 1 by Andy Murray this week -- had earlier appeared to vent his frustrations after losing a first-set tiebreaker in his 6-7 (10), 6-0, 6-2 victory.He nearly tagged his coach Boris Becker with a ball seemingly struck in the direction of his players box, and was given a code violation by chair umpire Carlos Bernardes.It was suggested to Djokovic in his postmatch news conference that he had been close to potentially hitting a spectator in the crowd, which could have resulted in him automatically defaulting the match.It didnt go down well with him. You guys are unbelievable, he said. Youre always picking these kind of things.Im close? Im still not suspended, so if Im not close, Im not close. It could have been [serious], yes. It could have snowed in the O2 arena, as well, but it didnt.Im the only player that shows his frustration on the court? Thats what you are saying?It is not an issue for me. Its not the first time I did it.Indeed, Djokovic also flirted with more serious punishment when he vented his frustrations in the Roland Garros quarterfinals earlier this year.After missing a break point in the second game of the third set of that 6-3, 7-5, 6-3 win against Tomas Berdych, Djokovic went to smash his racket into the dirt, only to see it slip out of his hand and fly into the back wall on Philippe Chatrier Court.Djokovic admitted at the time he was lucky -- had he hit the nearby line judge, who was forced to take evasive action, he could possibly have been disqualified.Instead, he escaped with a warning for racket abuse after quickly apologizing to chair umpire Eva Asderaki Moore in Paris.[It was a] high intensity, high level of tennis in the first set, Djokovic continued in his news conference. We didnt really give each other too many chances. I think we each only had one break point. We both went for shots. A lot of long rallies. It was over an hour, the first set.When I had the great comeback of saving six set points, then I didnt manage to win that first set, of course youre frustrated. On the other hand, you know, I think I managed to kind of compose myself and really gather all my attention and concentration to what was coming up after that.The great start of the second set helped me to regroup.Djokovic is chasing a record-equaling sixth Tour Finals title in London, which would see him immediately regain the No. 1 ranking form Murray. Cheap Pittsburgh Steelers Jerseys . Already owning gold from competition in Vancouver in 2010, Loch posted a combined four-run time of 3:27.526. That included a track-record third run of 51. NFL Jerseys From China . 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PHILADELPHIA -- The Philadelphia 76ers held a team meeting Thursday and may take action in the wake of the organizations decision to cancel the national anthem performance by a singer wearing a We Matter jersey.Sevyn Streeter said she was told by the team she could not perform the anthem before Wednesday nights season opener because of the slogan.The Sixers players met at their practice facility in Camden, New Jersey, and are considering whether to respond to Streeters cancellation.Everybody expressed their emotions about it, forward Robert Covington said. We want to take steps about it. We just dont know exactly what steps we want to take. We talked about a lot of different things.The Sixers play at home Saturday afternoon against Atlanta.Streeter said in an interview with The Associated Press late Wednesday she was told she would not sing just minutes before her performance.Id say two minutes before we were about to walk out ... the organization told me that I could not wear my shirt while singing the national anthem at their game, the R&B singer said by phone. I was never given any kind of dress code. I was never asked beforehand to show my wardrobe.The Sixers declined to say why Streeters performance was canceled.The Philadelphia 76ers organization encourages meaningful actions to drive social change. We use our games to bring people together, to build trust and to strengthen our communities. As we move from symbolic gestures to action, we will continue to leverage our platform to positively impact our community, the Sixers said in a statement.The Sixers had a member of their dance team sing the anthem.Sixers management declined comment on Thursday.Coach Brett Brown said there are several options on the table.We understand the situation and we respect the social issue involved, Brown said Thursday. We completeely get it.dddddddddddd As a group, we will try to find a way to deal with this.Streeter has written songs for Chris Brown, Ariana Grande and other stars. In 2013, she had a Top 40 hit with It Wont Stop, a duet with Brown that reached RIAA gold status.The singer, born Amber Denise Streeter, said she was hurt by the NBA teams actions.I was angry, extremely, extremely angry and disappointed and honestly brought to tears by all of it. It broke my heart, she said. Honestly, I was very excited about being able to perform the national anthem. I was really looking forward to that.This isnt the first time the Sixers were brought into a national anthem controversy. A woman performing the national anthem before the team played a preseason game in Miami did so while kneeling at midcourt.Denasia Lawrence opened her jacket just before she started to sing, revealing a Black Lives Matter shirt, then dropped to her left knee and performed the song. She said it was her way of protesting racial oppression.The anthem issue has been a major topic in sports in recent months, starting with the decision by San Francisco 49ers quarterback Colin Kaepernick to not stand while it is played. Kaepernick cited racial injustice and police brutality among the reasons for his protest, and athletes from many sports -- and many levels, from youth all the way to professional -- have followed his lead in various ways.I also felt it was important to express the ongoing challenges and ongoing injustice we face as a black community within the United States of America -- thats very important to me, Streeter said. Yes, we live in the greatest country in the world but there are issues that we cannot ignore. This cant be ignored. ' ' '