A final between Andy Murray and Roger Federer would bring together two compelling storylines on Wimbledons Centre Court on Sunday.Murray has ambitions of winning his first Grand Slam title in three years and Federer is seeking his first major in four years, which would take him to a record eight Wimbledon titles and an unprecedented 18 Grand Slams.But Canadas Milos Raonic, who plays Federer in a semifinal on Friday, and Murrays semifinal opponent, Tomas Berdych, might just have something to say on the matter (both matches Friday on ESPN/WatchESPN). Here are five reasons the in-demand match might not materialise:Federer hangoverA round after Federers great escape in the quarterfinals against Marin Cilic, the Swiss star might fall a little flat. He is 35 next month and hopes to become the oldest man of the professional era to win Wimbledon. He was moving well in the fifth set of the quarterfinal against the Croatian, but there could be a delayed reaction.Federer missed this years French Open because of a back injury -- the first Grand Slam he hadnt competed at since the 1990s -- and has had other injury problems this season.The adrenaline surge brought on by the clash with Cilic - Federer came from two sets down and saved three match points -- could be enough to carry him through to the final, or it could leave him exhausted, and there must be a little doubt about how his body will recover.John McEnroeTwo years ago, Raonic reached his first Wimbledon semifinal and lost to Federer. Arguably, the greatest difference between 2014 and this summer is John McEnroe, who joined the Canadians team this summer as a consultant.The New Yorker and ESPN analyst has been urging his charge to come forward more and to impose himself on matches, both of which he has been doing.No doubt, the straight-talking, positive McEnroe will also have Raonic believing as never before that he can progress into a first Grand Slam final.Fast conditionsSunshine is forecast for Friday, and the warmer it is, the faster the balls will fly through the air. That would probably help Raonic and Berdych, enhancing their serving strength, more than Federer and Murray.Raonic has served up to 143 mph at this tournament, though on a hot day he could touch 155 mph, which is his personal record.Berdychs fastest serve of the tournament so far travelled at 135 mph. Thats 1 mph faster than Murrays fastest of The Championships, while Federers speediest was 128 mph.No one has hit more aces this fortnight than Raonic (114). For comparison, Federer has produced 65, though many of his would have come through placement rather than raw power and speed.Berdychs tally for the tournament so far is 56 aces, while Murray has served 44, and a hot day could see many more fly through.Peak powersBerdych is playing his best grass-court tennis in years, and this is the deepest he has gone in the Wimbledon draw since he was the runner-up to Rafael Nadal in 2010.When Berdych sees the ball as if its one of those giant ones in the Wimbledon Gift Shop, and when hes hitting the sweet spot with his forehand -- as might well be the case on Centre Court on Friday -- theres not very much his opponent can do about it. As Murray observed in his BBC column: Tomas hits a big ball.Theres also an unknown aspect to this match -- it will be their first meeting on grass. A top-10 player and former Wimbledon finalist, Berdych wont be described as a dark horse. And yet, considering he has reached this stage, he hasnt been scrutinised too closely.In all the excitement on Wednesday, with Federer and Murray surviving five-setters, and Raonic ending the run of Americas Sam Querrey, Berdychs victory against Frenchman Lucas Pouille almost went unnoticed. Could he surprise everyone?Czech mateMurray might again have difficulties finishing an opponent off. While he led Jo-Wilfried Tsonga?2-0 in sets in their quarterfinal, and was later a break up in the fourth set, he needed five to go through.If Murray is in the ascendancy against Berdych, but then doesnt close down the match, could the Czech take greater advantage than Tsonga did?Theres no way Im losing this match, Murray shouted in the direction of his guest box early in the fifth set against Tsonga. Defiance may not be enough if Berdych is on form. Air Force 1 Norge .Y. -- Injured Buffalo Sabres forward Marcus Foligno did not practice with the team Monday and head coach Ron Rolston said its unlikely hell play in Wednesdays season opener in Detroit. Air Force 1 Herre Norge . Louis Rams wide receiver Stedman Bailey last Sunday. The fine is the fourth this season for Goldson. He was fined $30,000 for a hit on the New York Jets Jeff Cumberland in Week 1. http://www.airforce1norge.com/ . Fred Couples, captain of the U.S. side, put it all into perspective. "We know whos in charge," he said. Nike Juvenate Norge .Y. -- Buffalo Bills coach Doug Marrone has drawn on his Syracuse connections once again by hiring Rob Moore to take over as receivers coach. Nike Sf Air Force 1 Norge .J. -- Marty Brodeur beat the Pittsburgh Penguins yet again. Hes the talk of the NRL and delivered a match-winning play in just his second match for Gold Coast but the hype surrounding Jarryd Hayne hasnt affected his Titans teammates.The Titans regained a top eight spot after last weekends thrilling one-point victory over Wests Tigers, with superstar recruit Hayne scoring the clinching field goal in a 19-18 victory.The recruitment of the ex-NFL player on a two-year deal with just five matches to go in the season had the potential to derail a tight-knit Titans outfit.A media circus quickly descended, with helicopters hovering over their Robina stadium to catch a glimpse of the former Parramatta stars first training run.As the Titans now head into a clash with bottom-placed Newcastle this weekend which could furtherr cement their chances of a first finals appearance in six years, Henry has praised his team for staying focused and not getting distracted by the Hayne sideshow.ddddddddddddThe teams handling it well, Henry said.Its big news. It was always going to be big news, whether he was playing here, playing at Parramatta or playing somewhere else. Its massive that hes involved this season, which we didnt think would happen, its great for the game.We need to feed off the back of that. Its renewed interest. Our fans are happy and rugby league is happy that hes back involved.Weve got him here and we need to utilise the hype around that. ' ' '