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  Yu, 29, took the final three frames, closing with breaks of 66 and 70, for a 6-4 victory and a place in the last 32.
  World champion Mark Selby held his nerve to see off world number 68 Daniel Wells 6-4 after trailing 4-3.
  Scotland's three-time champion John Higgins came back from 3-2 down to beat Thailand's Noppon Saengkham 6-4.
  Welshman Mark Williams eased past England's Andrew Higginson 6-2, while Matthew Stevens beat Michael White 6-4 in an all-Welsh contest.
  England's Ali Carter beat Robbie Williams 6-2, but fellow Englishman Barry Hawkins went down 6-5 to Ireland's Fergal O'Brien, who made five centuries including three in a row at one stage.
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  "It was a battle," Selby told World Snooker.
  "My focus dipped in and out. It is still the early stages of the tournament, I don't want to peak too soon."
  Higgins won four of the last five frames to overcome Saengkham, ranked 69 places below him at 73 in the world.
  "I dodged a bullet there, I'm just delighted to get through," said Higgins.
  "I really did think I'd be heading up the road when I went 4-3 down. A lot of these boys are not frightened of top players any more. I felt as if the luck had ran out but the luck's still with me just now."
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summary: World number two Stuart Bingham suffered a shock defeat by world number 62 Yu Delu of China in the second round of the UK Championship in York.