Marcus Willoughby Owen (4 April 1935 – December 1987)[1][2][3] was a Welsh professional snooker player.

As an unknown quantity, Marcus was not expected to progress far; however, he beat Dennis Taylor and Maurice Parkin to set up a last-16 meeting with Gary.

Gary held Marcus to 5–5 at one point, but could not prevent him from pulling away to reach the quarter-final with a 15–8 victory.

Owen had no further success in professional snooker, his last match being a 0–6 loss to Tony Chappel in the first round of the 1985 edition of the Welsh Professional Championship; having held 17th place in the inaugural world rankings in 1976, he had not occupied a position on the list since 1980.

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