Mercedes team principal Toto Wolff has admitted that he remains cautious of the threat posed by seven-time Formula 1 champion Lewis Hamilton, conceding that his former driver will be a major obstacle in tomorrow's Barcelona-Catalunya Grand Prix. <br>Speaking to Sky Sports F1 following a close qualifying session, Wolff explained that when Hamilton is "in the right frame of mind and the car suits ...<a class='more' href='https://www.motorsport.com/f1/news/toto-wolff-admits-lewis-hamilton-threat-after-barcelona-f1-qualifying/10829969/?utm_source=RSS&utm_medium=referral&utm_campaign=RSS-F1&utm_term=News&utm_content=www'>Keep reading</a>