LEWIS HAMILTON has refused to enter into a war of words with F1 foe Adrian Sutil despite being labelled a "coward." Former Force India driver Sutil, 29, was furious Hamilton did not testify in the court case at which the German was convicted of GBH. But McLaren's 2008 world champion Hamilton, 27, did not comment on the remarks made by his former friend and insisted instead he wanted to focus on his driving. He said: "I think I can be a lot better than last season. A lot of this sport is in the mind. It is important you have 100 per cent capacity to focus on driving and results." Sutil was handed an 18-month suspended sentence and fined £167,000 in a Munich court for an assault on Lotus team owner Eric Lux in a nightclub after last season's Chinese Grand Prix. Sutil said: "Lewis is a coward. He is for me no man. Even his father sent me a text message and wished me luck for the court case. Lewis came with nothing."