Ronnie O'Sullivan of England during his first round match against Marco Fu of China on day three of The Dafabet Masters at Alexandra Palace on January 16, 2018 in London, England.
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Heading into the final session with a 6-3 lead the 43-year-old Englishman looked in fine form after a 131 break in the final frame of the afternoon.
However, his gritty opponent hit back in the evening session, taking six of the next eight frames to move to within one of victory.
O'Sullivan was not finished though and won the penultimate frame to set up a decider.
And it was then that his class shone through, a century securing a dramatic victory.
"We both didn't play great," said O'Sullivan.
"I'm just pleased to be competing. My main goal is to come out here and enjoy it, play with freedom.
It's just a game. It's nice to still be playing.
"It's a great venue, great tournament, great crowd. If everyone's enjoyed it, then great.
"We want to perform and play the best we can.
"I was lucky today - that double there, I got away with it."
Afternoon Session, Semi-finals
Round 1 - Donington Park
Fourth Session, Semi-finals
Women's Singles, Day 5