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BARCELONA, Spain - Mercedes rivals hope a busy three weeks of tinkering on their slower cars and the move to European tracks will be enough to at least threaten Lewis Hamiltons and Nico Rosbergs stranglehold on Formula One. Authentic Maxime Lajoie Jersey . The Mercedes pair head into Sundays Spanish Grand Prix after sweeping the first four races in impressive style, with the most compelling driving coming between the teammates while the pack puttered away in the distance. The switch to V6 turbo hybrid engines has dislodged Red Bull as F1s dominant team after four seasons, and Mercedes was also dealing far better than the rest with the new powertrain and other rule changes. Hamilton has led a Mercedes one-two finish with Rosberg in the last three races after the German won the season opener. The silver-and-teal duo have also taken all four pole positions, and set the fastest lap at each grand prix. "We are now four races into the 2014 season and hold a strong position in both championships," Mercedes team executive director Toto Wolff said. "However, the first European round of the year always provides a prime opportunity for teams to arrive with improvements to their cars. Of course, we are no different to any other team in that respect and our aim must be to increase the advantage we enjoyed at the last race in China." Neither Hamilton nor Rosberg has yet to win at the Circuit de Catalunya, although they did take the top two positions in qualifying here last year. Rosberg, who has a four-point lead over Hamilton in the championship, said that after years of racing and preseason tests at Barcelona "there is probably no other track in the world" that he knows better. "I also have some good memories of race weekends in Barcelona," Rosberg said. "Last year (...) I started from pole position so Im looking forward to going back there again, and maybe repeating that particular feat. Each team will have been pushing hard during the break to find some extra performance from new parts. So it will certainly be an interesting weekend." Red Bull will be counting on making strides after a dismal start to Sebastian Vettels title defence. Vettel has yet to finish better than third place, and has twice been ordered by his team to let new teammate Daniel Ricciardo pass him for higher finishes in the last two races. Vettel said a lot would depend on doing well in Saturdays qualifying because the track design offers few chances to challenge front-runners. The Montmelo circuit features one long straightaway before the first corner, which is considered the best for overtaking. It is also known to be tough on tires. Paul Hembery, the director of tire provider Pirelli, said that despite the tracks abrasive surface and high temperatures they expected teams to need only three pit stops instead of four as they have made in the past. Ferraris Fernando Alonso proved last season that wise tire management and smooth pit stops can be enough to compensate for a lack of overall speed. Alonso enters the race in a distant third place, with 41 points to Rosbergs 79 and Hamiltons 75, but after managing to finally reach the podium at Shanghai in Ferraris first race under new team principal Marco Mattiacci. The two-time former world champion has a strong record in front of his home fans, with wins here both last year and in 2006 to give him seven career podium finishes at the Spanish GP. His victory one year ago was Ferraris last as a team. With Alonso and teammate Kimi Raikkonen far behind the pacesetters, the Italian team will need a near perfect weekend to break its poor run. "With Fernando weve seen an extraordinary level of performance, scavenging every possible point at every possible opportunity," Ferrari technical director James Allison said. "We are learning how to get performance out of this new set of regulations, and hopefully to make this car more competitive. The key to a successful season is to keep improving your car at every race." Cheap Ottawa Senators Gear . He made that dream a reality Wednesday night. Olt, who grew up in Branford, Connecticut, attended UConn and made a nearly 2 1-2 hour trek to Boston a handful of times to watch the Red Sox, belted a two-run homer, one of four hit by Cubs in a 16-9 rout that completed a three-game interleague series sweep. Authentic Ryan Dzingel Jersey .m. ET, CBSOPENING LINE — Packers by 3RECORD VS. SPREAD — New England 7-4, Green Bay 5-5-1SERIES RECORD — Tied 5-5. http://www.cheapsenatorsjerseysauthentic.com/?tag=authentic-paul-carey-jersey . PAUL, Minn.DOHA, Qatar -- Ninth-seeded Ana Ivanovic of Serbia advanced to the second round of the Qatar Open on Tuesday after Slovakias Daniela Hantuchova retired from their match with a right knee injury. Ivanovic was leading 7-5, 1-0 when Hantuchova withdrew after falling 0-40 behind in the second game. The match started slowly for Ivanovic, who surrendered her first two serves as Hantuchova took a 5-3 lead. But Ivanovic won the next four games to secure the set, winning the ninth game at love with her final three serves being aces. "She started really well, and I managed to get back into the set and break her back," Ivanovic said. "I played some really good tennis towards the end of that first set and then in the second." Wildcard entrant Alisa Kleybanova of Russia also advanced after her opponent retired. At 5-5 in the first set, 10th-seeded Dominika Cibulkova of Slovak Republic, the recent Australian Open finalist, retired from the match with a gastrointestinal illness. "I was really looking forward to playing this week in Doha," said Cibulkova, who was making her first tournamment appearance since becoming the first Slovakian to reach a Grand Slam final. Authentic Chris Tierney Jersey. "Unfortunately I became very sick today and suddenly did not feel well. I wanted to give it a try today and I did everything I could to try to play, but I could not continue." Karin Knapp, who led Italy to a 3-1 Fed Cup victory over the United States in Cleveland at the weekend, was told she had to be in Doha to play a first round match on Tuesday. Knapp started her journey early Monday morning and after going from Cleveland to Washington DC, and then to Dubai, she landed in Doha on Tuesday in time to play her afternoon match. Knapp played impressive tennis to defeat Caroline Garcia of France 6-4, 6-1 straight off the plane. Four players who chose to skip playing the Fed Cup tie between the U.S. and Italy in order to get to Doha early -- Sloane Stephens, Francesca Schiavone, Roberta Vinci and Flavia Pennetta -- have all lost their first round matches. 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