Mercedes boss Toto Wolff says his team is being uber-cautious when it comes to the reliability of its two cars over the rest of the season.With four races remaining, Nico Rosberg and Lewis Hamilton are in a straight fight for the title with 33 points separating them ahead of Sundays U.S. Grand Prix. Hamiltons campaign has been dogged by a series of reliability issues, including an engine failure while leading the Malaysian Grand Prix last month, and on Friday night in Austin, Mercedes mechanics broke their FIA-imposed curfew to change the fuel system on his car.We just saw some data we were not sure of, whether it was all right, Wolff explained. Our main aim is to give them a reliable car so they can fight it out on track, and we are being maybe uber-cautious at the moment.Hamilton said he was trying not to think about the potential problems.I didnt know [about the fuel system before qualifying]. I dont know why I didnt know -- I was just focused on the job. I wasnt actually aware so I didnt have any concerns at that point but I am conscious of it. Maybe you should ask Toto about it and why theres a knock-on effect.When Wolff was asked if there could be any ramifications to the fuel system change, he said: Generally this season we have more mechanical reliability situations which we need to get on top of, and we are trying to contain that at the moment.Following the engine failure in Malaysia, Mercedes decided to delay the introduction of new engines for its customer teams while it investigated the issue. Despite its customers fitting new engines this weekend as well as Rosberg taking a fresh power unit, Wolff admitted the big-end bearing failure at Sepang is still not fully understood.No it hasnt been fully understood yet. Its still under investigation. Weve seen this season that sometimes the complexity of the kit makes it difficult to pinpoint down one single thing. Sports Jerseys . -- Teemu Selanne scored the first goal of his 22nd NHL season, and the Anaheim Ducks extended the best start in franchise history with their fifth straight victory, 3-2 over the Calgary Flames on Wednesday night. College Michael Jordan Jersey . Breaking three of his own world records on his way to winning in Paris, Chan silenced the critics and left the audiences standing in appreciation and awe. https://www.sportsstarsjerseys.com/tom-brady-jersey/ . Aaron Harrison scored a 22 points for Kentucky (6-1), which has won four in a row following a Nov. 12 loss to current No. 1 Michigan State. Julius Randle overcame a scoreless first half and added his sixth double-double in as many games with 14 points and 10 rebounds. College Tom Brady Jersey . Laudrup revealed Thursday he was notified of his dismissal in "the briefest of letters which gave no reasons why such hasty and final action was deemed necessary. Authentic Tom Brady Jersey . The 43-year-old closer, in his 19th and final big league season, has said hed like to play the outfield. Yankees manager Joe Girardi says hes thinking about allowing Rivera to do it this weekend, when the Yankees finish their season with a three-game series at the Houston Astros. BIRMINGHAM, Ala. -- Lafayette Rutledge scored 27 points and made a key 3-pointer with 38 seconds left in double-overtime and Nicholls beat Samford 106-103 on Sunday night.Rutledges 3 gave Nicholls a 102-100 lead. Samfords Christen Cunningham missed a jumper on the ensuing series, and Jahvaughn Powell made two free throws and the Colonels had a four-point lead with 12 seconds left. Demetrius Denzel-Dyson missed a 3-point shot for Samford, and Powell added two more free throws with five seconds left to seal it for the Colonelss.dddddddddddd Cunningham hit a 3 at the buzzer.JaDante Frye scored 33 points to lead Nicholls (4-3), which shot 16 of 36 from 3-point range. Rutledge made seven 3-pointers.Denzel-Dyson had 40 points and 11 rebounds for Samford (3-3). Triston Chambers added 24 points.The Bulldogs made 15 of 26 3-point baskets but were just 16 of 25 from the free-throw line. The Colonels made 20 of 22 free throws. ' ' '