{
    "classifications": [
        {
            "column": "Name",
            "label": "session_entity",
            "confidence": 0.93,
            "reason": "Player whose matches repeat across rows, giving each player a timeline."
        },
        {
            "column": "Date",
            "label": "session_time_axis",
            "confidence": 0.9,
            "reason": "Match date orders each player's activity."
        },
        {
            "column": "Tournament",
            "label": "none",
            "confidence": 0.5,
            "reason": "Tournament name repeats across years and does not uniquely identify one episode without the date."
        },
        {
            "column": "Surface",
            "label": "none",
            "confidence": 0.95,
            "reason": "Categorical attribute of the court."
        },
        {
            "column": "Rd",
            "label": "none",
            "confidence": 0.8,
            "reason": "Round label within a tournament; it is categorical and not a timestamp or counter."
        },
        {
            "column": "Rk",
            "label": "none",
            "confidence": 0.95,
            "reason": "Player ranking measure."
        },
        {
            "column": "vRk",
            "label": "none",
            "confidence": 0.95,
            "reason": "Opponent ranking measure."
        },
        {
            "column": "against",
            "label": "none",
            "confidence": 0.85,
            "reason": "Garbled opponent descriptor, nearly unique per row, not a session identifier."
        },
        {
            "column": "Score",
            "label": "none",
            "confidence": 0.95,
            "reason": "Match result attribute."
        },
        {
            "column": "TP",
            "label": "none",
            "confidence": 0.95,
            "reason": "Match statistic (total points)."
        },
        {
            "column": "Aces",
            "label": "none",
            "confidence": 0.97,
            "reason": "Match statistic."
        },
        {
            "column": "DFs",
            "label": "none",
            "confidence": 0.97,
            "reason": "Match statistic (double faults)."
        },
        {
            "column": "SP",
            "label": "none",
            "confidence": 0.97,
            "reason": "Match statistic (serve points)."
        },
        {
            "column": "1SP",
            "label": "none",
            "confidence": 0.97,
            "reason": "Match statistic (first-serve points)."
        },
        {
            "column": "2SP",
            "label": "none",
            "confidence": 0.97,
            "reason": "Match statistic (second-serve points)."
        },
        {
            "column": "vA",
            "label": "none",
            "confidence": 0.97,
            "reason": "Opponent aces statistic."
        },
        {
            "column": "Time",
            "label": "none",
            "confidence": 0.9,
            "reason": "Match duration, not an event timestamp."
        }
    ]
}