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Key takeaways
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64.8%
A 60% map favourite wins a best-of-three about 64.8% of the time, against 60% in a best-of-one.
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40%
The underdog wins 40% of Bo1s but only about 32% of Bo5s in the same matchup.
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Rules
Organisers set rules on pauses, remakes and stand-ins, which decide how bookmakers settle some bets.
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ESIC
Many organisers, including ESL and DreamHack, are members of the Esports Integrity Commission.
What tournament organisers control
Organiser decisions that move the odds
| Decision | Who makes it | Effect on betting |
|---|---|---|
| Match format (Bo1, Bo3, Bo5) | Organiser | Changes how often favourites win |
| Schedule and match order | Organiser | Rest days, back-to-back series, time zones |
| Bracket (single or double elimination, Swiss) | Organiser | How many chances a team gets; outright odds |
| Patch and map pool | Usually the game publisher; organisers pick the version | Which strategies and maps are in play |
| Official data partner | Organiser or league | Speed and coverage of in-play markets |
| Rules on pauses, remakes, stand-ins | Organiser | How some bets are settled or voided |
How the format changes a favourite's chances
Assume each map is independent and the stronger team wins 60% of maps. Its chance of winning the series rises with the series length:
Series win chance for a 60% map favourite
Longer series favour the better team. The same matchup is worth 1.67 in a Bo1 but 1.46 in a Bo5.
| Format | Favourite wins | Underdog wins | Fair odds on the favourite |
|---|---|---|---|
| Best of one | 60.0% | 40.0% | 1.67 |
| Best of three | 64.8% | 35.2% | 1.54 |
| Best of five | 68.3% | 31.7% | 1.46 |
Worked example: Bo3 = p²(3 − 2p); Bo5 = p³(10 − 15p + 6p²), with p = 0.60 per map. Real maps are not fully independent (map picks favour each team in turn).
Official data and in-play markets
In-play markets run on official data feeds that send events from the game server to bookmakers. Leagues and organisers sell these rights, so the depth of live markets on an event depends partly on its data deal. Big events usually have fast, complete feeds and many live markets; small online cups may have only pre-match odds.
The feed reaches bookmakers before the public stream reaches you. Read our guide to stream delay before betting in-play.
Integrity rules and why they protect bettors
The Esports Integrity Commission (ESIC) was set up in 2015 as a members' association to deal with match-fixing and betting fraud. Its members include tournament organisers such as ESL and DreamHack. Betting operators and gambling regulators join as anti-corruption supporters and share suspicious betting alerts through ESIC's network.
For you this means events run by members have a process for investigating suspicious matches. Lower-tier events outside these structures carry more integrity risk, and that is one reason to keep stakes small on obscure matches.
Tournament organisers and betting: common questions
Does the match format change esports odds?
Yes. Longer series favour the stronger team. A 60% map favourite wins about 64.8% of best-of-threes and 68.3% of best-of-fives.
Why do upsets happen more in group stages?
Many group stages use best-of-one matches, which give the weaker team its full single-map chance.
Who decides the patch for a tournament?
The game publisher releases patches; the organiser or league decides which version the event is played on, often announced before it starts.
What is ESIC?
The Esports Integrity Commission, an association founded in 2015 that works with organisers, betting operators and regulators against match-fixing and betting fraud.
Why do some events have no live betting markets?
Live markets need an official, fast data feed. Smaller events may not have one, so bookmakers offer only pre-match odds.
Related guides
Intel Extreme Masters
BLAST Premier
DreamHack Tournaments
PGL CS:GO Major
League of Legends World Championship
The International
