Mark Allen became only the fourth player in the history of the Masters snooker to make a maximum break of 147 on his way to the semi-finals.
He came from 4-1 down to beat Mark Selby at Alexandra Palace
In the last-4 tonight, Allen will face Ali Carter - who knocked out reigning champion Judd Trump.
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Ronnie O'Sullivan will take on Shaun Murphy in the first semi-final this afternoon.
