F1 drivers are under pressure to perform every time they get behind the wheel of their cars but some are undoubtedly more in need of a strong result than others at this weekend’s Spanish GP. Amid the backdrop of Max Verstappen and Daniil Kvyat trading Red Bull places, and Nico Rosberg leaving Lewis Hamilton and Sebastian Vettel trailing in the world title battle, we asked some of the Sky Sports F1 team to pick the drivers who they feel are under the most pressure at Barcelona… TED KRAVITZHalf the grid is under severe pressure. From Daniil Kvyat, to show that Red Bull were wrong to drop him. From Jolyon Palmer, to see off the pressure from Esteban Ocon. From Lewis Hamilton, to get his championship going again. And to Sebastian Vettel because Sergio Marchionne, the Ferrari president, says he expects a win here.When is the Spanish GP and how can you watch it on Sky SportsBut the biggest pressure has to be on Max Verstappen. Red Bull have caused the disruption by changing their driver line-up and now they need the justification - and its up to Verstappen to deliver on that. Its his first weekend with a new team and new engineers, so I would say that is the biggest pressure of the weekend right there on his young shoulders. DAVID CROFTThere are 22 drivers under pressure this weekend.You cant say one is under more pressure, really, because of the environment of F1: everybody has to beat their team-mate, to produce the goods, and justify why theyre in that seat.At Renault, Jolyon Palmer is under pressure to have a really good race on a track he knows well. Kevin Magnussen knows it equally as well and can make life difficult for Jolyon.Obviously, Daniil Kvyat will be looking for a good result to boost his confidence and to put it into the back of Helmut Markos mind he could still be the man for the top team. Max Verstappen has also got to deliver now he has been promoted, while Daniel Ricciardo has got a third different team-mate at the senior team so hell be under pressure too to prove he is still the numero uno there.Spanish GP talking points Then theres Lewis Hamilton, who is under pressure because he needs a good result. But hes not driving badly, so hell continue doing what hes been doing.So the man under the most pressure is Nico Rosberg because hes the guy who is leading the championship. He is the hunted, everybody else are the hunters. Hes got a 43-point lead to defend at a race track where hell be confident of a successful weekend.The guy under the most pressure is always the one whos leading the championship - but dont discount the individual pressures that are on the other 21 drivers as well. SIMON LAZENBYIts Daniil Kvyat who is under the most pressure.Altruism and Formula 1 dont often go hand in hand and my impression, in this cut-throat world, is that Max Verstappen wouldnt have lost much sleep over whats gone on - but Kvyat is probably not particularly well rested.Whats different on the cars in BarcelonaHes certainly under pressure now. Hes probably been lying awake at night thinking about his future because hes been put in a very difficult position.Watch the Spanish GP live on Sky Sports F1. The race starts at 1pm on Sunday, with build-up underway at 11.30am. Or watch the race without a contract for £6.99 on NOW TV. Also See: Spanish GP talking points Whats different on the cars in Barca Pittsburgh Penguins Gear . With his new coach and six-time Grand Slam singles champion Boris Becker watching him during an official match for the first time, Djokovic appeared tentative early against the Slovakian player, who often appeared content to keep the ball in play. 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Winger Antonio Winterstein has failed to prove his fitness for North Queenslands NRL preliminary final against Cronulla on Friday night.However, boom teenager Kalyn Ponga remained on standby for veteran centre Kane Linnett when the Cowboys flew out for Sydney on Wednesday.Cowboys assistant Todd Payten ran a line through Wintersteins name as a rowdy North Queensland contingent bid farewell to their beloved NRL club at Townsville airport.He wont be training with us, no, Payten said of Wintersteins plight.The winger was not named for the Sharks clash but had been hoping to battle back from a rib complaint that forced him to miss last weeks extra-time semi-final win over Brisbane.Javid Bowen will now slot onto the wing for Winterstein.But the jury is out on whether Linnett will return from a hamstring complaint that sidelined him for the sudden death semi-final.North Queensland coach Paul Green described Linnett as likely to play the grand final qualifier in a reshuffled backline.Cowboys under 20s star Ponga still flew out with the team on Wednesday.Kalyn is coming down as cover for Kane, Payten said.The coaches believe its also a good experience for Kalyn to see how we do things travelling away and being in the finals system.But we expect him to run out for the 20s.Cowboys coach Paul Green said Linnett will be given every chance to take the field against the Sharks.ddddddddddddHes worked hard doing everything he can around the clock to get back in, Green said.He (Ponga) didnt let anyone down last week, he did a good job on his debut.(But) he is there as back-up.The Cowboys under 20s play reigning premiers Penrith in their own Friday night preliminary final.Ponga - just 18 - became the sixth player in 30 years to make his NRL debut in a final after being a shock call up for Winterstein against Brisbane.But Ponga belied his age to amass 174m, two tackle busts and a line break, almost scoring with his second touch.He has already earned the next Johnathan Thurston tag.Ponga got the thumbs up from the man himself.Hes obviously got a big future at the club, Cowboys co-captain Thurston said of Ponga.Hes come through the system.Theres a genuine pathway and players can now aspire to follow him.His impressive debut has ensured the Cowboys will begin off-season contract extension talks, despite Pongas current deal not expiring until the end of 2017.Rival NRL clubs as well as rugby union and even the AFLs Brisbane Lions are believed to be ready to pounce. 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