Oxford United suffered a shock on their return to action at the Kassam Stadium when they trailed at half-time to Tamworth.
Goalkeeper Ryan Clarke fumbled a speculative 20-yard shot from Iyseden Christie above his head, and the ball dropped over the line.
The U's had begun the match well with three shots in the first four minutes, but they then faded.
It might have been worse. Tamworth's Tom Shaw also struck a shot against the bar.
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