alking to Boston Celtics big man Al Horford as they dealt with concussion symptoms. Horford missed three weeks while dealing with a concussion o

ABU DHABI, United Arab Emirates -- Brazilian Felipe Massa is definitely retiring after the season-ending Abu Dhabi Grand Prix this weekend and British driver Jenson Button has no plans to come back.With more than 550 races between them, the highly popular 30-somethings will be missed on the F1 circuit.The 36-year-old Button is making way for Belgian driver Stoffel Vandoorne, who will partner Fernando Alonso at McLaren next year.Button retains an option to race in 2018 if both parties agree, although at this stage that seems unlikely.I go into this weekend thinking its going to be my last. I dont want to be racing in Formula One beyond this race, said Button, who will be in a consultancy role with McLaren next year. This is the way I think about it. But who knows, this could change in six months or one year.Button won the F1 title against the odds in 2009 for the Brawn team, and has 15 GP victories overall.You get to Formula One with many dreams and you aspire to be something, Button said Thursday at a news conference ahead of Sundays race. Ive raced with two of the teams I dreamt of racing with as a kid: Williams and McClaren -- and when I did win the championship, it was with a privateer team.After his first F1 race at age 20, Button is set to start his 305th GP on Sunday, putting him just one behind seven-time F1 champion Michael Schumacher of Germany.I will definitely step away from Formula One happy with what Ive achieved, said Button, who hopes F1 will become more competitive when rule changes aimed at making cars faster come into play next season.The main reason to turn on and watch Formula One is the fighting. Basically Mercedes are doing too good a job and no one else is doing a good enough job, Button said. Hopefully the rule changes will help teams find a new direction.Its not been a great season for either driver. Massa is 11th overall, while Button is 15th, and neither of them has finished higher than fifth this year.Massa, one of the most well-liked drivers on the circuit, overcame a serious head injury sustained at the Hungarian GP in July 2009.He never won the F1 title, missing out the year earlier in the cruelest fashion.After winning the season-ending GP in Brazil, he thought the title was his and his Ferrari team began celebrating wildly.But Lewis Hamilton moved up to fifth place right at the end of the race and pipped him to the title by one point.Sunday will be Massas 250th start and this time he intends to finish the race, after crashing out of the Brazilian GP two weeks ago.I even prepared the Brazilian flag, said the 35-year-old Massa, who won his 11 career races driving for Ferrari. I was so disappointed to finish like that.Still, at least it gave him the chance to walk around the track and soak up the atmosphere from his devoted fans.Its difficult to describe. It was such an emotional feeling, said Massa, who was 20 when he first raced in F1. I started to cry and I couldnt hold it back.Then, as he entered the paddock, he was given an ovation.When I got back to the pit lane I saw all the teams out (to greet me) and I couldnt believe it, Massa said.It reminded him that, even though he never took the title during his heyday with Ferrari, he won widespread respect and admiration.That is what you represent on the human side, Massa said. Thats really a lot bigger than a simple trophy. Kris Russell Jersey . Clarke was injured while practicing on the Doha Golf Club range after the pro-am on Tuesday. 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CHICAGO -- Bulls small forward Doug McDermott will play Thursday night against the San Antonio Spurs after missing the past 11 games because of a concussion.Its been a long couple weeks, McDermott said after Thursdays shootaround. But it finally feels good to be able to go out there and compete, so Im excited.McDermott suffered his first concussion on Oct. 31 in a win over the Brooklyn Nets and missed a game before returning. He suffered another concussion on Nov. 12 in a win over the Washington Wizards and has been out for almost a month.Youve got to listen to your symptoms, McDermott said. I think with the second one in such a short period of time, they wanted to be cautious. And I did, too. Because its not like an ankle sprain or a knee deal, where you can play through things like that. Its your brain, so you want to be as sharp as possible.The Bulls are banking on McDermotts 3-point shooting ability to help a bench that comes into Thursdays game shooting a league-worst 39.3 percent.I think well get our swagger back, too, McDermott said. Once we get myself and Michael [Carter-Williams] back. Weve been rotating guys that arent used to playing with each other. Once we get some continuity there with that group, things will look better.McDermott, in his third NBA season, is averaging?10.6 points in nine games.?Adding another shooter like me is going to help guys like Niko [Mirotic], take pressure off Niko,, take pressure off Isaiah [Canaan], thinking they need to hit shots, he said.dddddddddddd I think having three floor-spacers out there will really help all of us.McDermott said he spent some time talking to Boston Celtics big man Al Horford as they dealt with concussion symptoms. Horford missed three weeks while dealing with a concussion of his own.I actually talked to him on the phone for about 30 minutes, McDermott said. He was in the middle of his and I just had my second one. We kind of just talked about our symptoms and he really took his time, and you see his game has been really good since hes come back.People dont really understand its a tough deal. Basketball can be physical. You see this a lot in football, but you really just got to be true to yourself, true to the doctors, because you dont want to mess around with these things.Bulls head coach Fred Hoiberg said McDermott would not be on a minutes restriction, but would be watched closely as he gets back into playing shape.Its great to have Doug back, Hoiberg said. Obviously hes been chomping at the bit to get himself back in the lineup. We just had to make sure everything went well and [he] passed all the necessary steps in the concussion protocol. ... Hes excited to be back and were certainly excited to have him. ' ' '