{
    "classifications": [
        {
            "column": "Name",
            "label": "session_entity",
            "confidence": 0.9,
            "reason": "Player whose matches repeat across rows, giving each a timeline"
        },
        {
            "column": "Date",
            "label": "session_time_axis",
            "confidence": 0.85,
            "reason": "Match date orders a player's activity, though stored as a string"
        },
        {
            "column": "Tournment",
            "label": "session_container",
            "confidence": 0.5,
            "reason": "A tournament is a bounded stretch of matches for a player, but the column may not separate editions by year"
        },
        {
            "column": "Surface",
            "label": "none",
            "confidence": 0.9,
            "reason": "Categorical attribute of the court"
        },
        {
            "column": "Rd",
            "label": "none",
            "confidence": 0.6,
            "reason": "Round label within a tournament, not a numeric counter"
        },
        {
            "column": "Rk",
            "label": "none",
            "confidence": 0.9,
            "reason": "Player ranking measure"
        },
        {
            "column": "vRk",
            "label": "none",
            "confidence": 0.9,
            "reason": "Opponent ranking measure"
        },
        {
            "column": "against",
            "label": "none",
            "confidence": 0.85,
            "reason": "Messy opponent text, near unique per row"
        },
        {
            "column": "Score",
            "label": "none",
            "confidence": 0.9,
            "reason": "Match result text"
        },
        {
            "column": "Dr",
            "label": "none",
            "confidence": 0.9,
            "reason": "Performance metric"
        },
        {
            "column": "A%",
            "label": "none",
            "confidence": 0.95,
            "reason": "Ace percentage metric"
        },
        {
            "column": "Df%",
            "label": "none",
            "confidence": 0.95,
            "reason": "Double fault percentage metric"
        },
        {
            "column": "1stIn",
            "label": "none",
            "confidence": 0.95,
            "reason": "First serve in percentage metric"
        },
        {
            "column": "1st%",
            "label": "none",
            "confidence": 0.95,
            "reason": "First serve points won metric"
        },
        {
            "column": "2nd%",
            "label": "none",
            "confidence": 0.95,
            "reason": "Second serve points won metric"
        },
        {
            "column": "Bpsvd",
            "label": "none",
            "confidence": 0.95,
            "reason": "Break points saved metric"
        },
        {
            "column": "Time",
            "label": "none",
            "confidence": 0.85,
            "reason": "Match duration, not an event timestamp"
        }
    ]
}