What Does Under 27 Mean?
In tennis sports betting, “Under 27” refers to a total games bet, where you’re predicting that the combined number of games played in a match will be less than 27.
- If the total number of games is 26 or fewer, your bet wins.
- If the total is 27 or more, your bet loses.
How Are Games Counted?
Every game in each set counts. Here’s how it’s calculated:
| Scoreline | Total Games |
|---|---|
| 6-3, 6-4 | 19 games |
| 6-4, 7-5 | 22 games |
| 7-6, 6-4 | 23 games |
| 6-4, 3-6, 6-4 | 29 games |
| 6-3, 6-7, 6-2 | 30 games |
So if a match goes to three sets, or even has tie-breaks, it could easily go Over 27.
Example of Winning an Under 27 Bet:
Match: Carlos Alcaraz vs. Jannik Sinner
Final Score: 6-3, 6-4
Total Games: 9 + 10 = 19 games
Under 27 wins
Example of Losing an Under 27 Bet:
Match: Daniil Medvedev vs. Alexander Zverev
Final Score: 6-7, 7-6, 6-4
Total Games: 13 + 13 + 10 = 36 games
Under 27 loses
Betting Tips for Under 27
- Target Mismatches (One-Sided Matches)
- If a top player faces a weaker opponent, the match may end quickly.
- Great spot for Under 27.
- Avoid Evenly Matched Players
- Players ranked closely usually go to three sets or tie-breaks.
- Bad spot for Under 27.
- Check Head-to-Head History
- If past matches between two players were short, that’s a good sign.
- Look for previous scores like 6-2, 6-3.
- Surface Type Matters
- Clay courts: Longer rallies, more breaks → fewer tie-breaks → good for Under.
- Grass/Indoor Hard: More holds of serve → more games → be cautious.
- Look at Players’ Playing Style
- Big servers (e.g. Isner, Opelka): Many tie-breaks → usually Over, so avoid.
- Returners & baseline grinders: More breaks, shorter matches → good for Under 27.
Pro Tip:
Use this formula to quickly evaluate:
Estimated Total Games = (Average games per set × Expected number of sets)
If it gives you a number below 27, Under 27 is worth considering.
Would you like a list of today’s best Under 27 betting picks or a calculator to help you assess matches?
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