Player Data JSON

{
  "player": {
    "id": 3907,
    "api_id": 463256,
    "name": "Mart Jan Kaak",
    "short_name": "M. J. Kaak",
    "country": "Netherlands",
    "country_code": "NL",
    "gender": "Male",
    "circuit": "ATP",
    "date_of_birth": null,
    "height_cm": null,
    "weight_kg": null,
    "plays": "",
    "turned_pro": null
  },
  "utr": null,
  "current_ranking": null,
  "ranking_history": [],
  "career_stats": {
    "total_matches": 5,
    "wins": 0,
    "losses": 5,
    "win_rate": 0.0
  },
  "surface_stats": {
    "hard": {
      "matches": 5,
      "wins": 0,
      "losses": 5,
      "win_rate": 0.0
    },
    "clay": {
      "matches": 0,
      "wins": 0,
      "losses": 0,
      "win_rate": 0
    },
    "grass": {
      "matches": 0,
      "wins": 0,
      "losses": 0,
      "win_rate": 0
    }
  },
  "category_stats": {
    "UTR": {
      "matches": 5,
      "wins": 0,
      "losses": 5,
      "win_rate": 0.0
    }
  },
  "average_match_stats": {
    "matches_with_stats": 5,
    "avg_aces_per_match": 2.0,
    "avg_double_faults_per_match": 3.2,
    "avg_first_serve_pct": 56.4,
    "avg_first_serve_won_pct": 57.3,
    "avg_second_serve_won_pct": 38.3,
    "avg_break_points_converted_pct": null
  },
  "recent_form": [
    {
      "date": "2026-01-03",
      "opponent": "Freek van Donselaar",
      "opponent_id": 401370,
      "tournament": "UTR PTT Arnhem Men 01",
      "surface": "hard",
      "round": "Semifinals",
      "result": "L",
      "score": "0-2",
      "stats": {
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        "double_faults": 4,
        "first_serve_pct": 57.49999999999999,
        "first_serve_won_pct": 60.86956521739131,
        "second_serve_won_pct": 57.14285714285714,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    },
    {
      "date": "2025-12-31",
      "opponent": "Twan Van Zijl",
      "opponent_id": 400497,
      "tournament": "UTR PTT Arnhem Men 01",
      "surface": "hard",
      "round": "",
      "result": "L",
      "score": "0-2",
      "stats": {
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        "double_faults": 4,
        "first_serve_pct": 47.05882352941176,
        "first_serve_won_pct": 66.66666666666666,
        "second_serve_won_pct": 57.14285714285714,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    },
    {
      "date": "2025-12-30",
      "opponent": "Roland Stuurman",
      "opponent_id": 258820,
      "tournament": "UTR PTT Arnhem Men 01",
      "surface": "hard",
      "round": "",
      "result": "L",
      "score": "0-2",
      "stats": {
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        "double_faults": 2,
        "first_serve_pct": 66.07142857142857,
        "first_serve_won_pct": 54.054054054054056,
        "second_serve_won_pct": 66.66666666666666,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    },
    {
      "date": "2025-12-29",
      "opponent": "Amadatus Admiraal",
      "opponent_id": 230995,
      "tournament": "UTR PTT Arnhem Men 01",
      "surface": "hard",
      "round": "",
      "result": "L",
      "score": "0-2",
      "stats": {
        "aces": 1,
        "double_faults": 3,
        "first_serve_pct": 57.446808510638306,
        "first_serve_won_pct": 44.44444444444444,
        "second_serve_won_pct": 23.076923076923077,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    },
    {
      "date": "2025-12-29",
      "opponent": "Zechariah Hamrouni",
      "opponent_id": 397928,
      "tournament": "UTR PTT Arnhem Men 01",
      "surface": "hard",
      "round": "",
      "result": "L",
      "score": "0-2",
      "stats": {
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        "double_faults": 3,
        "first_serve_pct": 54.09836065573771,
        "first_serve_won_pct": 60.60606060606061,
        "second_serve_won_pct": 50.0,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    }
  ],
  "form_summary": {
    "last_10_matches": 5,
    "wins": 0,
    "losses": 5,
    "form_string": "LLLLL"
  },
  "head_to_head": [
    {
      "opponent": "Twan Van Zijl",
      "opponent_id": 400497,
      "matches": 1,
      "wins": 0,
      "losses": 1
    },
    {
      "opponent": "Zechariah Hamrouni",
      "opponent_id": 397928,
      "matches": 1,
      "wins": 0,
      "losses": 1
    },
    {
      "opponent": "Roland Stuurman",
      "opponent_id": 258820,
      "matches": 1,
      "wins": 0,
      "losses": 1
    },
    {
      "opponent": "Freek van Donselaar",
      "opponent_id": 401370,
      "matches": 1,
      "wins": 0,
      "losses": 1
    },
    {
      "opponent": "Amadatus Admiraal",
      "opponent_id": 230995,
      "matches": 1,
      "wins": 0,
      "losses": 1
    }
  ],
  "upcoming_matches": [],
  "year_statistics": null,
  "data_generated_at": "2026-01-30 14:26:09 UTC"
}