Jannik Sinner just won the 2025 Australian Open, setting him up to potentially win all four Grand Slams this year. Currently (2025-01-26 22:05:59 UTC), Manifold is predicting 24% for the French Open, 31% for Wimbledon, and 29% for the US Open. Simple multiplication (assuming no correlation, which I highly doubt) would indicate a 2.16% chance of winning all four. What do you think?

Rules:

• This seems pretty non-subjective, so I may bet in this market.

• Close date may be adjusted to reflect schedule changes.

• If for any reason one of the tournaments does not play in 2025, but is played later and considered the "2025" make-up tournament, it will count, and the close date will be extended.

• If a tournament is cancelled altogether, resolves N/A.

Feel free to ask clarifications!