Compare like with like
Check singles versus doubles, tournament stage and player identity before comparing two numbers. A similarly named player or an exhibition listing is not automatically the same event.
Probability is a calculation
At decimal odds of 1.80, the inverse price is 55.56%. This is a price-based quantity before margin, not an independently verified chance of victory. In a complete two-outcome market, add both inverse prices before interpreting the margin.
An interrupted match
An official winner after retirement does not establish settlement for every bookmaker. Some contracts distinguish a completed match from a match that has started. Read the specific rule rather than extrapolating from a previous bet.