By Phil Harlow
BBC Sport at the Crucible
Hendry is struggling for form
Stephen Hendry was made to dig deep on his way to a 13-10 second-round win over fellow Scot Drew Henry.
The final session began with Hendry 9-7 in front, but Henry wasted no time in taking the first three frames of the session to edge 10-9 in front.
But the threat of an upset was averted as Hendry hit back with three frames in a row including breaks of 58 and 130.
And when Henry missed a simple red with the rest in the last frame, Hendry cleared up to move into the quarter-finals where he will play Mark Williams or Quinten Hann.
"Drew's such a tough player to play," said Hendry afterwards.
"He never gave up the whole match but fortunately I was able to raise a gear when I needed it."
Hendry is second-favourite behind Mark Williams to win the tournament after Ronnie O'Sullivan's surprise first-round exit.
But the 34-year-old Scot insists it is still a strong field.
"There are more players than Ronnie - there's plenty of quality there."
Second round result:
Stephen Hendry (Sco) 13-10 Drew Henry (Sco) 44-68, 35-71 (64), 28-65, 74-48, 59-23 (54), 117-4 (115), 83-18, 69-55, 65-32, 54-68, 114-0 (114), 22-60, 100-13 (65), 1-109 (86), 72-42, 59-1, 53-61 (57), 7-69 (69), 64-72 (59 Hendry), 63-7 (58) 130-0 (130), 62-26, 72-25 (66)