Grand slam winner
A grand slam winner is a player who wins all his or her possible games of Countdown unbeaten. To become a grand slam winner, one must go undefeated in the heats, then win his or her series (becoming a xicount), and finally become the Champion of Champions.
To date, there have been five grand slam winners:
- Harvey Freeman won Episodes 459 through 466, the Series 10 finals, and Championship of Champions III. He also won the Supreme Championship, giving him the most total wins of any grand slam winner. However, he was defeated by Mark Nyman in a contest from the short-lived Countdown Masters series.
- Nic Brown won Episodes 658 through 665, the Series 14 finals, and Championship of Champions IV.
- Don Reid won Episodes 1361 through 1368, the Series 25 finals, and Championship of Champions VII. However, he did lose to John Clarke in the Supreme Championship.
- Scott Mearns won Episodes 2553 through 2560, the Series 41 finals, and Championship of Champions X. His unbeaten record came to end in a special match.
- Graham Nash won Episodes 2813 through 2820, the Series 43 finals, and Championship of Champions XI.
An arguable case can be made that Conor Travers also qualifies as a grand slam winner, given that, in addition to becoming an octochamp and the champion of Series 54, he won the 30th Birthday Championship, which was held during a time when Championships of Champions were on hiatus. However, he had also participated, and been defeated, in CoC XII beforehand.
A grand slam winner is typically the #1 seed for his or her series. The only exception is Graham Nash, who was #2 seed behind David Williams.