Valtteri Bottas says Mercedes must work hard if it is to overturn Ferrari’s pace advantage ahead of the Chinese Grand Prix next weekend, citing its straight-line speed as being a big concern. Bottas comfortably won the opening race of the year in Australia for Mercedes, but the team struggled to match Ferrari for outright pace in Bahrain. 5774263478001 CrashTV:  Mercedes was only able to secure a one-two finish after Ferrari drivers Charles Leclerc and Sebastian Vettel suffered setbacks, leaving it under no illusions about the gap to make up ahead of the next round in China. Bottas said Ferrari made a “massive gain” in straight-line speed in Bahrain, and conceded that it left...
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