The change sets up a doubleheader of racing on Sunday at the 2-mile speedway in Fontana, Calif.&nbsp;<br>The 400-mile Cup race is scheduled for a 3:30 p.m. ET start and broadcast on Fox Sports. The 300-mile Xfinity race will now take place following the Cup race with an approximate starting time of 8 p.m. ET and broadcast on Fox Sports 2.<br>Last week's winner at Daytona, Austin Hill, will start ...<a class='more' href='https://www.motorsport.com/nascar-xs/news/fontana-nascar-xfinity-race-postponed-rain/10436651/?utm_source=RSS&utm_medium=referral&utm_campaign=R SS-NASCAR&utm_term=News&utm_content=www'>Keep reading</a>

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