The takeover of Swiss bank Credit Suisse leaves many sports stars, teams and tournaments with a big question mark hanging over their lucrative sponsorship deals.The Swiss national football team, the country's top football division, tennis great Roger Federer, golf star Sergio Garcia and Zurich's new stadium were all sponsored by the bank, which is being taken over by Swiss rival UBS. The deal was hastily arranged on Sunday after Credit Suisse's share price plunged.