Racing started with the Supersport event and Alastair Seeley moves into an early leadThe umbrellas come out as rain showers move in to make tyre choice a crucial factor for the ridersA delighted Bruce Anstey celebrates winning the Supersport race after leaders Lee Johnston and Alastair Seeley crashed out on the final lapMichael Dunlop had to settle for second as his brother William celebrates victory after a thrilling first Superbike race - Conor Cummins completes the podiumSpectators rise to their feet to to congratulate William Dunlop after he edged out his brother Michael to win the opening Superbike raceLee Johnston leads the riders at York Corner and the Fermanagh man went on to secure his second Supertwins success at the meetingLee Johnston has every reason to be happy after his win made it a Supertwins double for the Maguiresbridge riderMichael Dunlop celebrates with his team after winning the feature Superbike race following a Superstock victory earlier in the dayMichael Dunlop moves clear in the Superstock race, which he won after it was stopped because of a crash