{
    "classifications": [
        {
            "column": "Name",
            "role": "attribute",
            "confidence": 0.6,
            "reason": "Player name, descriptive label with 462 distinct values; could also be grouped on"
        },
        {
            "column": "Date",
            "role": "dimension",
            "confidence": 0.95,
            "reason": "Match date, time axis for slicing"
        },
        {
            "column": "Tournament",
            "role": "dimension",
            "confidence": 0.85,
            "reason": "Tournament name/category used to group and filter"
        },
        {
            "column": "Surface",
            "role": "dimension",
            "confidence": 0.98,
            "reason": "Low-cardinality categorical court surface"
        },
        {
            "column": "Rd",
            "role": "dimension",
            "confidence": 0.97,
            "reason": "Round code, categorical with 13 values"
        },
        {
            "column": "Rk",
            "role": "dimension",
            "confidence": 0.55,
            "reason": "Player ranking; numeric rank used to bucket/slice, high cardinality"
        },
        {
            "column": "vRk",
            "role": "dimension",
            "confidence": 0.55,
            "reason": "Opponent ranking; numeric rank used to bucket/slice"
        },
        {
            "column": "against",
            "role": "attribute",
            "confidence": 0.6,
            "reason": "Single empty value, no analytic content"
        },
        {
            "column": "Score",
            "role": "attribute",
            "confidence": 0.9,
            "reason": "Free-form match score text with many distinct values"
        },
        {
            "column": "DR",
            "role": "measure",
            "confidence": 0.85,
            "reason": "Dominance ratio, numeric stored as text"
        },
        {
            "column": "TPW",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Total points won percentage"
        },
        {
            "column": "RPW",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Return points won percentage"
        },
        {
            "column": "vA%",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Opponent ace percentage rate"
        },
        {
            "column": "v1st%",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Percentage rate metric"
        },
        {
            "column": "v2nd%",
            "role": "measure",
            "confidence": 0.9,
            "reason": "Percentage rate metric"
        },
        {
            "column": "BPCnv",
            "role": "measure",
            "confidence": 0.7,
            "reason": "Break points converted as count/total; numeric quantity stored as text"
        },
        {
            "column": "Time",
            "role": "measure",
            "confidence": 0.75,
            "reason": "Match duration, aggregatable quantity"
        }
    ]
}