The Six Nations Grand Slam — winning all five matches in the Championship — is the pinnacle achievement in the tournament and one of rugby's most celebrated accomplishments. This guide covers the Grand Slam betting market for 2027, which nations are typically fancied, and how the market moves as the rounds progress.
What Is a Grand Slam?
A Grand Slam is achieved when a nation wins all five of their Six Nations Championship matches across the five rounds in February and March. It is the highest individual achievement in the Championship. Grand Slams are relatively rare — the combination of five competitive matches and the possibility of an upset in any round means only teams in exceptional form typically achieve it.
Grand Slam Market vs Outright Winner
The Grand Slam market is distinct from the outright Championship winner market. A team can win the Championship without a Grand Slam if other results go in their favour. The Grand Slam market typically offers longer odds than the outright winner market — for example, a team priced at 5/4 to win the Championship might be 3/1 or 4/1 to achieve the Grand Slam.
Who Is Likely to Challenge for the Grand Slam in 2027?
Looking ahead to 2027, the Grand Slam contenders are expected to be drawn from Ireland, France and England — the three nations with the squad depth and consistency to win five from five. Ireland has achieved Grand Slams in recent campaigns and will again be among the leading contenders. Any Grand Slam prediction carries significant uncertainty given the competitive nature of all five fixtures.
In-Tournament Grand Slam Betting
Once a team wins their first two or three rounds, Grand Slam odds shorten dramatically. After a perfect opening two rounds, prices typically move from 3/1 to 4/5 or shorter — most of the value has gone. If backing for the Grand Slam, pre-tournament prices are significantly better than mid-tournament.
Responsible Betting
Grand Slam bets are season-long and cannot be cashed out in most formats. Budget for the full five-round exposure. Contact the Gambling Awareness Trust at 1800 753 753 or visit gamblingcare.ie. 18+ only.
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Compare Betting Odds →Frequently Asked Questions
Grand Slams are achieved roughly once every two or three seasons across the entire competition. With six nations each playing five matches, the mathematical opportunity exists every year, but the competitive balance of the Championship means that most seasons see at least one upset that prevents any team winning all five.
No — only one team can achieve the Grand Slam in any season. If two teams are unbeaten going into their direct head-to-head fixture, one must lose, eliminating both from Grand Slam contention at that point. It is therefore impossible for two teams to both complete the Grand Slam in the same Championship.
Some bookmakers offer a specific 'Grand Slam winner' market; others integrate it into the outright winner market or offer it as a yes/no for each individual nation. Check with your specific GRAI-licensed bookmaker for the format available.
A Grand Slam bet requires all five wins. If your selected team wins four but loses one, the Grand Slam bet loses regardless of whether they win the Championship. The bet is settled on five wins only.