Mercedes and Ferraris battle for F1 supremacy has ramped up at the Russian GP with both teams spending their first in-season engine development tokens. Ferrari drivers Sebastian Vettel and Kimi Raikkonen will race with new internal combustion engines in Sochi after the team spent three of the nine tokens they had left over from the winter.Meanwhile, Mercedes have used two of their 13 outstanding tokens on fuel system improvements, which their championship-defending works outfit and three customers teams - Williams, Force India and Manor - will all benefit from this weekend. However, none of the eight Mercedes-powered cars in question are required to fit fresh engines as the improvements come outside the sealed areas of the power unit. The world champions have also introduced a new oil from suppliers Petronas.Mercedes now have 11 tokens left to use over the remaining 17 races. Ferraris need for performance improvements are more acute with the Scuderia already over 50 points adrift of Mercedes in the Constructors Championship. The teams start to the season has been hindered by reliability problems, with Vettel and Raikkonen both registering a DNF apiece in the opening three rounds.It seems that Ferrari spent three of their engine tokens on combustion, which is half for performance and half for reliability, said Sky Sports F1s Ted Kravitz.That means Vettel is now on his third engine out of five for the season. We presume that the swapping around will only last so far and hell have to take a sixth. Raikkonen is on his second engine.Hopefully well see more for the neutral this weekend.Watch the whole Russian GP weekend - LIVE ONLY on Sky Sports F1. The race begins at 1pm on Sunday, with build-up from 11.30am. Or watch the race without a contract for £6.99 on NOW TV. Also See: Rosberg: Rivals will fight back Red Bull taking aim at Ferrari Cincinnati Reds Gear . Hes still nowhere close to throwing yet. The four-time MVP was in good spirits when he made his first public appearance on the field since having neck surgery Sept. Cheap Reds Jerseys . She was a pioneer. She did things on skis that made the birds take notice. https://www.cheapredsjerseys.us/ . -- Miami Dolphins defensive co-ordinator Kevin Coyle defended the management style of coach Joe Philbin in the wake of the teams bullying scandal. Reds Jerseys 2020 . The Brazilian-born strikers brace drew him level with Real Madrid star Cristiano Ronaldo as the leagues leading scorers with 17 goals apiece through 16 rounds. "The important thing is to help the team win, not the goals," Diego Costa said. After a first half dominated by defence, Atletico pressed Valencia into its area and Diego Costa did the rest. Wholesale Reds Jerseys . Long snapper Patrick Mannelly announced Friday that he is retiring after a 16-year-career with the Bears, a span in which he played in a team record 245 games and snapped the ball 2,282 times.Sebastian Vettel is delighted Ferrari retained Kimi Raikkonen for another year and claims the pair have the least ego problems in the whole paddock. Ferrari have ended speculation surrounding their 2017 seat by confirming the Finns new deal, with Vettel and Raikkonen now set to enter their third year as team-mates.Unlike at rivals Mercedes, the Scuderias former world champions seem to be in perfect harmony both on and off the track and Vettel is confident this will help the team going forward. Are Ferrari waiting for Hamilton?Its the right thing to do, the German told Sky Sports News HQ. We are both pushing very hard. Our primary target is to catch the leaders, Mercedes, and theres plenty of work ahead of us. I think its important, theres been a lot of talk, and it now goes quiet.Probably Kimi and myself have the least ego problems in the whole paddock, which I think is good for the team. We are working in the same direction and on the track we try to race hard - as weve shown in the past in the races where we have raced for position - but thats normal.Outside of the car there is no problem. Ferraris revised Halo cockpit head-protection system made its debut in the opening practice session of the the British Grand Prix at Silverstone. This seemed to surprise Jenson Button, partnered by Fernando Alonso at McLaren, to no end. Come aggain?!, the British driver posted on Twitter.ddddddddddddaikkonen will enter his 15th year in Formula 1 next season and has insisted that Ferrari will be his last team in the sport.I dont think the reason Im staying here is because were friends or not, he said.If I wasnt doing my job correctly I wouldnt be here, and thats not the case. They were happy, Im happy, so thats only what happens. Jenson Button speaks to Craig Slater ahead of the British Grand Prix Sergio Perez, Romain Grosjean and Carlos Sainz were considered frontrunners for the seat before Raikkonens new deal, while Sky Sports have been told that Ferrari are keeping their options open should Lewis Hamilton become available at the end of 2017.Team principal Maurizio Arrivabene says Raikkonens extension was confirmed so early because Ferrari want to concentrate on improving the SF16-H and catching Mercedes.Halo Two trialled in British GP P1We confirmed Kimi because, first of all, he deserves it, Arrivabene said. We are looking for the interest of the team and the interest of the team is not looking for other drivers, but concentrating in the cars development.We have two good drivers and now we remove all the pressure from Kimi. Also See: Are Ferrari waiting for Hamilton? Halo Two trialled in British GP P1 ' ' '