LONDON -- With both Serena and Venus Williams through to the last four at the All England Club, the sisters could end up playing each other in a Grand Slam final for the first time since the 2009 edition of The Championships.Tennis fans shouldnt be getting ahead of themselves. With Serena to play Russias Elena Vesnina and Venus to meet Germanys Angelique Kerber in Thursdays semifinals, here are five reasons why that hoped-for all-Williams title match might not materialise:Serenas self-doubtFor Serena, every match is a fight against herself -- she has to overcome that emotion as well as her opponent, her coach, Patrick Mouratoglou, observed recently.Winning Wimbledon again would put Serena level with Steffi Grafs modern-era record of 22 Grand Slam titles, and the closer she gets to history, the more likely she is to experience nerves or self-doubt on the grass.I cant expect Serena not to be human. Serenas emotions show that she cares. She feels something, and she has to fight through those emotions and find solutions on the court, Mouratoglou said.Serena, whose 21st major came at Wimbledon last year, has faltered at her past three Grand Slams -- in the semifinals of last seasons US Open, and in this years Australian Open and Roland Garros finals. Have those defeats left little rips and tears in Serenas on-court psyche?Kerbers confidenceThis is the first time that Kerber has played this tournament as a Grand Slam champion, after her triumph at Januarys Australian Open, and she has never been as self-assured on grass as she is now.That Melbourne victory made her the first German woman to score a major singles title since Graf at Roland Garros in 1999, and she is the only one of the semifinalists yet to drop a set this tournament. No wonder Kerber has been saying, I have a lot of confidence.She already has defeated one Williams sister at a Grand Slam this season too -- with that Australian success coming against Serena -- so why cant she also beat the other one here in the last four? I know how to play on grass, said Kerber, who is in her second Wimbledon semifinal.Major memories fadeCan Venus still remember how to win a Grand Slam semifinal? Its a long time since she played at this stage of a major, with that last appearance in the final four coming at the 2010 US Open.And its seven years since Venus won a Grand Slam semifinal -- that was at the 2009 Wimbledon Championships, when she finished as the runner-up to her sister.However, unlike her younger sister, she wont be walking out on to the grass with a racket bag loaded up with pressure and expectation.At the age of 36, and the oldest Grand Slam semifinalist since Martina Navratilova here in 1994, Venus can play a lot more freely than Serena, carrying mostly romantic hopes on her shoulders rather than anything heavier.Fearless VesninaOf the four semifinalists, its the unseeded Russian who has the least to lose on Thursday. She also has resolved to make the most of her contest with Serena (having fun is about the last thing that will be on the younger Williams sisters mind on Centre Court).Thats a dream semifinal, Vesnina said after getting through to the last four. Nothing can be better than playing against Serena in a semifinal on Centre Court at Wimbledon. Its special.Of course, I need to try to win this match. Its not only about you have to show your best tennis. You have to stick to your game, you have to be solid, you have to enjoy yourself on the court. Of course, I will try to win it.And the more freely Vesnina plays, the more Serena might start doubting herself.Record defenceKerber will be looking to protect Grafs record of 22 Grand Slam titles again. Her victory over Serena at the Australian Open prevented the Californian from going level with the German who dominated the womens game. Yeah, I think I helped Steffi right now, Kerber said after that Melbourne victory.Clearly, Kerbers main motivation will be to win a first Wimbledon title, with any thoughts for Graf secondary.But patriotism could still be a factor if her views on the German soccer team, who play their own semifinal against France in the European Championships on Thursday, are anything to go by.I am looking forward to both [semifinals] actually, Kerber said after beating Dominika Cibulkova in her quarterfinal. I will start, then I hope that the German football team will make the final as well.She would be doing her bit for German tennis if she could beat Venus as that probably would give her a final against Serena and the opportunity to once again stop history being made. NFL Jerseys Cheap . - Connor McDavid scored 53 seconds into overtime as the Erie Otters came from behind to defeat the visiting Guelph Storm 4-3 on Saturday in Ontario Hockey League action. Wholesale NFL Jerseys Fast Shipping . The catch: It needs a lot of money, and it needs it fast. http://www.jerseyswholesalenfl.net/ . Detroit and Boston are deadlocked, 1-1, and Tigers manager Jim Leyland could be forgiven if he was caught rationalizing instead of dissecting how his club could blow a 5-1 lead late in Game 2. Cheap Jerseys Free Shipping . Darren Helm scored on Detroits sixth attempt in the shootout and then Jonas Gustavsson stopped Andrew Shaws shot, lifting the Detroit Red Wings to a 5-4 win over the Chicago Blackhawks on Wednesday night. Discount Nike NFL Jerseys . The Oilers come in having lost five in a row (0-4-1) and 16 of their last 20 games, dropping a 2-1 decision to the Vancouver Canucks on Tuesday.Oliver Burke admits he is still adjusting to life in Germany since his surprise summer move to the Bundesliga, but is already targeting the title with his new club. Burke, 19, raised eyebrows across British football in August when he signed for newly promoted RB Leipzig in a £13m deal from Nottingham Forest having played just 35 senior games.Officially RasenBallsport Leipzig - the club was formed in 2009 when Red Bull purchased the playing rights to local fifth-tier side SSV Markranstädt, rebranding the club in the companys image and cannily circumventing German footballs strict rules on corporate influence. Burke moved from Nottingham Forest to Leipzig Four promotions later, the city of Leipzig has welcomed top-flight football for the first time since 1994 and the team has hit the Bundesliga like a whirlwind.On the pitch, Leipzig is a hotbed young European talent - the upstart of the Bundesliga determined to upset the established order - and after winning promotion to the top flight for the first time since 1994, they are unbeaten in 10 games and sit second behind Bayern Munich on goal difference, with Burke contributing a goal and two assists already. Burke speaks to Sky Sports in Leipzig Its an amazing feeling to be second in the Bundesliga at the moment and still doing so well and comfortably winning matches as well as a team. We are doing very well and it is great, he told Sky Sports News HQ.Can we win the Bundesliga? Me personally, I believe we can, of course. But we cant think about that too much, we have to concentrate and go into each game and give 100 per cent and still keep working hard on the training field. But everybody strives for the top and everybody wants to win trophies, medals and stuff so why not?I want to win the Bundesliga and I want to win it with RB Leipzig. Why not? We have the players, the quality; we have a great team so there is no reason why we cant. For sure, it is a good shout to be in the Champions League but we take every game as it comes and we keep working hard and certainly we will get there with our hard work and dedication. Burkes new home is as a member of the Red Bull Leipzig squad Off the pitch, Burke is coming to terms with his move away from England.The biggest difference is probably driving on the other side of the road. And trams are everywhere in this city! That was hard to adjust to - youre checking thhe corner and there is a tram coming and you think, Am I meant to be here in the car? You dont know where to go.dddddddddddd It was a challenge at first but now Ive adapted.The German is getting there - it is going to take a bit of time. Its a first proper language for me to learn but Im eager to learn it. Burke is having to pick up German in between Leizpig training sessions One-to-one German tuition is part of the daily routine for Burke at the world-class training complex of Der Roten Bullen, which is only 30 minutes walk - or 10 minutes on a tram - from Leipzig city centre. Across the river from the training ground is the Red Bull Arena, formerly the Zentralstadion, which hosted five games at the 2006 World Cup. For Burke, its a world away from the City Ground. Watch NOW TV Watch Sky Sports for just £6.99. No contract. Its very much different - sometimes you dont want to get away from this place, it has everything you need. We have a sauna steam room, the physiotherapy is fantastic, we have DVD rooms where we can watch our games and see where we need to improve on and there is always something you can improve on in yourself.We never leave the training ground until very late because we have our food here, everything is all cooked by a great chef for us; I guess it is everything you need to become a better player. Burke heads to Leipzig training Its been amazing so far and the team is so close and Ive bonded very well with the players. Many of the players speak English so it is quite easy to adapt and I get with everyone. They are a great bunch of boys and we are all young and we all strive for the same thing and we all want the same goal - to do the very best and to go into every game to win.I guess it is a brave move for me but I dont regret any of my decisions whatsoever. I am very happy and every day I keep learning, keep getting better and better and see where it gets me but it is a great club.I wouldnt say Im homesick at all really, my family have come over whenever they can. They pretty much come to every game, their support is unreal. But everyone is like family at this club, everybody looks after each other. Whenever there is a problem, everyone is there for you and it is one big family this club and it is really nice. Also See: Bundesliga fixtures Bundesliga table ' ' '