Championship leader Nico Rosberg remained the man to beat at Mercedes in Practice One at the Russian GP as he set a commanding pace from team-mate Lewis Hamilton.In an opening session at the Sochi Autodrom totally dominated by F1s world champions, Red Bull still claimed most attention by debuting their answer to the sports search for improved cockpit protection for drivers.Daniel Ricciardo completed an installation lap with the teams aeroscreen concept attached to the front of his RB12. The windscreen-like device successfully held up in static tests away from the circuit last week, when an F1 wheel was fired at it at 225kph. After Ferrari trialed a halo design in winter testing, Red Bulls idea has split opinion, amid the FIAs search for a workable solution to be incorporated into the design of the all-new 2017 cars. Daniel Ricciardo completes a single installation lap with Red Bulls new aeroscreen canopy On the timesheet in Sochi, Mercedes immediately appeared at their best at the former Winter Olympics venue and ended P1 one second ahead of Ferrari.Their advantage was flattered by the fact Rosberg and Hamilton set their best laps on the quickest tyres available, the supersofts, whereas the Ferrari pair did not. However, Rosbergs 1:38.127 time was still an eye-catching early effort when compared to Hamiltons.The world champion, aiming to get his title defence properly up and running after a string of problematic races at the start of 2016, could not match Rosbergs speed on the supersofts and wound up 0.7s adrift. He was also one of a number of drivers to spin with the track offering up little grip so far.Sky F1 schedule: When is the Russian GP?Sebastian Vettel recovered from two lurid spins to take third place ahead of Kimi Raikkonen, as both Ferraris stuck with the slower soft tyres. With the SF16-Hs engine believed to have been upgraded for this race, the under-pressure Scuderia did run into some early reliability problems - albeit of the mechanical kind via a DRS fault on Raikkonens car.Williams Felipe Massa was sidelined by a clutch fault in the early stages of the session, but steadily worked his way up the order on his return and ended a promising fifth.Once the canopy had been taken off his car, Daniel Ricciardo showed flashes of speed to take sixth, ahead of the second Williams of Valtteri Bottas and other Red Bull of Daniil Kvyat. Kvayt, aiming to build on the second podium finish of his career at the last race in China, lost the back end of his RB12 rounding Turn 17 but, despite spinning 180 degrees, was able to continue without damaging his car.The Russian was joined in the P1 field by countryman Sergey Sirotkin, who returned to an F1 car for the first time in two years after signing with Renault as a test driver earlier this week.The 20-year-old, whose one previous practice outing at the top level came with Sauber at the inaugural Sochi race in 2014, performed well on his debut in the RS16, finishing 13th - five places and 0.7s ahead of Renault regular Jolyon Palmer.McLarens Jenson Button (11th) and Fernando Alonso (12th) again finished just outside the top 10, with both former champions also caught out by the track conditions. Button spun at Turn 15, while Alonso went straight on at Turn Two on several occasions.Practice One timesheet1. Nico Rosberg, Mercedes, 1:38.1272. Lewis Hamilton, Mercedes, 1:38.8493. Sebastian Vettel, Ferrari, 1:39.1754. Kimi Raikkonen, Ferrari, 1:39.3325. Felipe Massa, Williams, 1:39.3656. Daniel Ricciardo, Red Bull, 1:39.6507. Valtteri Bottas, Williams, 1:39.8028. Daniil Kvyat, Red Bull, 1:40.2189. Sergio Perez, Force India, 1:40.28710. Carlos Sainz, Toro Rosso, 1:40.65411. Jenson Button, McLaren, 1:40.66312. Fernando Alonso, McLaren, 1:40.77113. Sergey Sirotkin, Renault, 1:40.89814. Felipe Nasr, Sauber, 1:41.08515. Max Verstappen, Toro Rosso, 1:41.13416. Esteban Gutierrez, Haas, 1:41.23817. Romain Grosjean, Haas, 1:41.38518. Jolyon Palmer, Renault, 1:41.67119. Marcus Ericsson, Sauber, 1:41.96220. Pascal Wehrlein, Manor, 1:42.48321. Rio Haryanto, Manor, 1:42.68722. Alfonso Celis, Force India, 1:43.432Watch 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. Every race live in 2016 Sky Sports F1 brings you every race live in 2016. 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Sagbo did well to control Sone Alukos right cross and fire past Brighton goalkeeper Peter Brezovan. Aluko was making his first start in four months after recovering from an Achilles injury.Australias coach Darren Lehmann will mentor the national team until the 2019 Ashes series in England before making his exit, with succession planning to be a key part of his role over the next three years.Lehmanns contract has been extended until October 2019 by Cricket Australia, having previously been elongated until next year. Since his appointment on the eve of the 2013 Ashes series, Lehmann has guided Australia to home Test victories over England, India, New Zealand and West Indies, away defeats of South Africa and New Zealand, plus lifting the 2015 World Cup, also at home.However, a heavy away loss in the UAE to Pakistan, the surrender of the Ashes in England last year and a surprising defeat to an unfancied Sri Lanka in Pallekele last week make it patently clear that Lehmann still has plenty of work ahead of him to advance Australias claim to the title of the worlds undisputed best team. In addition to the multiple retirements that followed last years Ashes, Lehmanns support staff have changed considerably in the past six months, offering him fresh faces with which to work towards those goals.The board have actually seen that we are doing okay as such, barring the result in the Test [at Pallekele], but looking forward to the next few years in charge and hopefully getting some wins in the sub-continent, first and foremost on the agenda, but developing the side as we are, Lehmann said. We have a different coaching group now coming in and the players are refreshed and I am looking forward to the challenge.I suppose the big one on everyones lips is the sub-continent - we certainly have to improve there. Ashes is a big home and away and, obviously, the World Cup. They are the big ones for us, as everyone knows, but you have got to try and win every games you play. For us, we just have to get better playing in all conditions.Probably the spinning ball on the sub-continent [is our biggest challenge] you would think. Swinging ball - a lot has been made of the England swinging ball and we won a couple of Test matches this time, albeit we lost the Ashes and the wickets they produced were very seam friendly. End of the day, that is the way cricket goes. For us, it is probably more the sub-continent conditions at the moment, getting prepared for that obviously with the next two Test matches here and then India at the back end.With typical frankness, Lehmann replied I would think it would be, yeah when asked whether the extended tenure would mark the completion of his time as coach. Between now and then, Australia face a tour of India, a Champions Trophy, another home and away Ashes contest and a World Cup in England.dddddddddddd The newly-appointed assistant coach David Saker, recent interim coach Justin Langer and Yorkshire coach Jason Gillespie will be among the candidates to eventually replace Lehmann.Well give those guys opportunities along the way. As Ive always said, its the best job in the world. I love the job. But its a job you cant do forever either, Lehmann said. So whatever opportunities we can give to the guys along the way we certainly will do. And then its up to the board what they do from there and the high performance department.I think youre judged on results most of the time all around the world not just on the subcontinent. I think youve got to play well and win a lot of games of cricket basically as a coach. Thats what players have to do, thats what coaches have to do in any sport. Youve got to hopefully keep getting the results that makes it a lot easier.The rapid improvement of the national teams results under Lehmann when first appointed three years ago arguably saved the jobs of more senior CA figures including the team performance manager Pat Howard and the chief executive James Sutherland. They have not yet forgotten this fact, allowing Lehmann the rare privilege of extending his role and also planning well in advance for life afterwards.This is a world away from the attitude the board once held, that Lehmann was too much of a maverick to be entrusted with a coaching job. Howard emphasised Lehmanns standing as a popular figure in Australian cricket and an influencer of the global game, in explaining the decision.We wanted certainty and stability for the playing group with both the coach and assistant coach contracted as we build towards the Ashes series and the 2019 World Cup, Howard said. Darren has had great success in the role and he and the National Selection Panel deserve a huge amount of credit for taking a relatively young side to number one in the world in two of the three formats.What often goes unseen is how big of a supporter Darren has been of the wider cricket system in Australia and that is crucial to the long term sustainability of Australian cricket. The commitment he shows to the role goes far broader that of the Australian mens team and extends into the global support of the game through his work on the ICC Cricket Committee. ' ' '