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. 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OXFORD, Miss. -- Georgia first-year coach Kirby Smart gets a second crack at trying to slow down Mississippi quarterback Chad Kelly.He knows from experience it wont be easy.Hes a little bit like a rodeo bull rider, Smart said. This guy will do anything and hes good at it. Trust me, I know from experience. Hes good.The 12th-ranked Bulldogs (3-0, 1-0 Southeastern Conference) are the higher-ranked team in this matchup , but will still be about a touchdown underdog when they travel to face the 23rd-ranked Rebels (1-2, 0-1) on Saturday. Georgia has won 10 straight games in the series dating back to 1996.Smart was Alabamas defensive coordinator last season when Kelly torched the Tide for 341 yards passing, three passing touchdowns and one rushing touchdown in a 43-37 victory for the Rebels.Now Smart is ready for round two. He said the goal is to keep Kelly off balance, and used a baseball metaphor to illustrate the Bulldogs plan.Youve got to be able to pitch, Smart said. Youve got to throw the fastball, youve got to throw a curveball. Youve got to be able to change it up and youve got to throw the slider. You cant do the same thing all the time.It is obvious Smart has a lot of respect for Kelly. The Ole Miss quarterback said the feeling is mutual when it comes to Georgias defense.Theyre big and athletic. They play really smart, Kelly said. I think thats a compliment to their head coach and their defensive coordinator. They do a really good job of staying in the right place. We have to make sure we play hard and keep the turnovers down.Kelly has thrown for 953 yards and 10 touchdowns this season, but his four interceptions have been costly. One was returned for a touchdown last week in the Rebels 48-43 loss to Alabama.I have to take it upon myself to keep putting it in my head to take care of the ball, Kelly said.---Some other things to watch when Ole Miss hosts Georgia on Saturday:ENGRAMS THE TARGET: Ole Miss senior tight end Evan Engram has emerged as Kellys favorite target this season.dddddddddddd Hes caught 20 passes for 302 yards this season. Both numbers are tops in the nation for a tight end. Said Kelly: Hes a heck of an athlete. Hes a playmaker, hes aggressive. He likes to hit people, too. Hes a blocker, so hes not just a receiving tight end.REBELS STRUGGLE TO KEEP LEADS: Ole Miss has already let two big leads get away during losses this season. The Rebels led Florida State 28-6 on Sept. 5 before eventually losing 45-34. Last weekend, Ole Miss had a 24-3 lead on No. 1 Alabama before the Tide rallied to win 48-43.GEORGIA CAN COME BACK: While Ole Miss has had trouble keeping leads, Georgia has proven adept at coming back after falling behind early in games. The Bulldogs trailed by 10 points to both North Carolina and Missouri before winning both games.CHUBBS RESURGENCE: Georgia running back Nick Chubb has had a great start to the season after missing a big chunk of 2015 with a serious knee injury. The 5-foot-10, 228-pound junior has run for 365 yards and three touchdowns through three games. Said Ole Miss coach Hugh Freeze: Another great test for sure. They are going to present a great challenge to us in the run game and weve got to be sure that our eyes are disciplined.MCKENZIE EMERGES: Georgia receiver Isaiah McKenzie is having a breakout year, catching 18 passes for 305 yards and four touchdowns in three games. He had 10 catches for 122 yards and two touchdowns in last weeks win against Missouri.----Follow David Brandt on Twitter: www.twitter.com/davidbrandtAP . AP College Football website: www.collegefootball.ap.org . ' ' '