Reading fans snapped up their allocation for next month's Thames Valley Derby inside 24 hours.
Over 15,000 turned out at the SCL Stadium for the 1-1 draw before Christmas, the first meeting with Oxford United for nearly 20 years.
The return fixture, on Saturday, February 3, has been moved forward to a 12.30 pm kick-off after discussions with Thames Valley Police.
Given a full allocation of 1,497 tickets, only supporters with more than 1200 loyalty points had the opportunity to purchase.
Only four teams have averaged more away fans this season than Reading, despite the Royals currently sitting in the relegation zone of League One.
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