Sauber team principal Monisha Kaltenborn says Pascal Wehrlein is working “flat out” on his fitness after sitting out the Chinese Grand Prix. Wehrlein sustained a back injury after crashing at the Race of Champions and did not compete at the first F1 pre-season test, but returned for the second group running. He was all set to race in the season-opener in Australia but pulled out ahead of Saturday’s running, being replaced by Ferrari reserve Antonio Giovinazzi. The German racer cited his lack of fitness and disrupted pre-season training as the cause, not feeling ready to complete a race distance in the more physical 2017 cars. Wehrlein has also been replaced by Giovinazzi...
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