Tennis markets use the event format and a defined scoring or settlement question. Tennis has points within games and games within sets. A match tie-break may replace a deciding set in some formats, so the competition format changes how a total can be interpreted. An illustrative 6–4, 6–4 result contains 20 completed games, while its set score is 2–0.
Price describes a conditional return
Decimal odds include the original stake in the total return. In a hypothetical example, a 100-unit stake at 2.40 returns 240 units if the selection wins: 140 profit plus the original 100. A losing selection returns nothing under ordinary win-or-lose settlement. These figures illustrate arithmetic, not a forecast.
The reciprocal of decimal odds gives a price-implied probability before adjusting for margin: 1 ÷ 2.40 is about 41.67%. It is not a measured certainty about the event. When the implied probabilities of every mutually exclusive outcome add above 100%, the excess indicates an overround in that set of prices.
Compare prices only for the same match, player and settlement conditions. Match-winner, set-winner and qualification markets are different propositions. Retirement, walkover and incomplete-match provisions can also change settlement, while fees or exchange commission can affect the amount retained.
Match, Period and Player Markets
A market title specifies what will be measured. Match winner asks for an outcome; a total asks whether a measured quantity finishes above or below a line; a player market concerns a named participant. The same fixture can contain many questions with different winning conditions.