Player Data JSON

{
  "player": {
    "id": 3848,
    "api_id": 510454,
    "name": "Yoshinori Kobayashi",
    "short_name": "Y. Kobayashi",
    "country": "Japan",
    "country_code": "JP",
    "gender": "Male",
    "circuit": "ATP",
    "date_of_birth": null,
    "height_cm": null,
    "weight_kg": null,
    "plays": "",
    "turned_pro": null
  },
  "utr": {
    "id": 5069616,
    "singles": 12.0,
    "doubles": null,
    "ranking": 1970,
    "division": "General",
    "is_pro": false,
    "updated_at": "2026-01-25"
  },
  "current_ranking": null,
  "ranking_history": [],
  "career_stats": {
    "total_matches": 6,
    "wins": 4,
    "losses": 2,
    "win_rate": 66.7
  },
  "surface_stats": {
    "hard": {
      "matches": 6,
      "wins": 4,
      "losses": 2,
      "win_rate": 66.7
    },
    "clay": {
      "matches": 0,
      "wins": 0,
      "losses": 0,
      "win_rate": 0
    },
    "grass": {
      "matches": 0,
      "wins": 0,
      "losses": 0,
      "win_rate": 0
    }
  },
  "category_stats": {
    "UTR": {
      "matches": 6,
      "wins": 4,
      "losses": 2,
      "win_rate": 66.7
    }
  },
  "average_match_stats": {
    "matches_with_stats": 6,
    "avg_aces_per_match": 0.3,
    "avg_double_faults_per_match": 3.8,
    "avg_first_serve_pct": 60.1,
    "avg_first_serve_won_pct": 65.5,
    "avg_second_serve_won_pct": 50.2,
    "avg_break_points_converted_pct": null
  },
  "recent_form": [
    {
      "date": "2025-12-28",
      "opponent": "Yuto Miyagawa",
      "opponent_id": 1159919,
      "tournament": "UTR PTT Saitama Men 05",
      "surface": "hard",
      "round": "Final",
      "result": "W",
      "score": "2-0",
      "stats": {
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        "double_faults": 2,
        "first_serve_pct": 53.48837209302325,
        "first_serve_won_pct": 54.347826086956516,
        "second_serve_won_pct": 33.33333333333333,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    },
    {
      "date": "2025-12-27",
      "opponent": "Robin Eldin",
      "opponent_id": 1122567,
      "tournament": "UTR PTT Saitama Men 05",
      "surface": "hard",
      "round": "Semifinals",
      "result": "W",
      "score": "2-1",
      "stats": {
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        "double_faults": 8,
        "first_serve_pct": 63.24786324786324,
        "first_serve_won_pct": 60.810810810810814,
        "second_serve_won_pct": 24.242424242424242,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    },
    {
      "date": "2025-12-26",
      "opponent": "Ewan Ogura",
      "opponent_id": 288523,
      "tournament": "UTR PTT Saitama Men 05",
      "surface": "hard",
      "round": "",
      "result": "W",
      "score": "2-0",
      "stats": {
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        "double_faults": 0,
        "first_serve_pct": 75.67567567567568,
        "first_serve_won_pct": 82.14285714285714,
        "second_serve_won_pct": 55.55555555555556,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    },
    {
      "date": "2025-12-25",
      "opponent": "Karl Kazuma Lee",
      "opponent_id": 265567,
      "tournament": "UTR PTT Saitama Men 05",
      "surface": "hard",
      "round": "",
      "result": "L",
      "score": "0-2",
      "stats": {
        "aces": 0,
        "double_faults": 3,
        "first_serve_pct": 60.71428571428571,
        "first_serve_won_pct": 64.70588235294117,
        "second_serve_won_pct": 45.45454545454545,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    },
    {
      "date": "2025-12-23",
      "opponent": "Shingo Masuda",
      "opponent_id": 509492,
      "tournament": "UTR PTT Saitama Men 05",
      "surface": "hard",
      "round": "",
      "result": "L",
      "score": "0-2",
      "stats": {
        "aces": 0,
        "double_faults": 4,
        "first_serve_pct": 61.66666666666667,
        "first_serve_won_pct": 54.054054054054056,
        "second_serve_won_pct": 52.17391304347826,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    },
    {
      "date": "2025-12-22",
      "opponent": "Taiyo Uenoyama",
      "opponent_id": 491801,
      "tournament": "UTR PTT Saitama Men 05",
      "surface": "hard",
      "round": "",
      "result": "W",
      "score": "2-0",
      "stats": {
        "aces": 1,
        "double_faults": 6,
        "first_serve_pct": 45.614035087719294,
        "first_serve_won_pct": 76.92307692307693,
        "second_serve_won_pct": 61.29032258064516,
        "break_points_converted_pct": null,
        "total_points_won": null
      }
    }
  ],
  "form_summary": {
    "last_10_matches": 6,
    "wins": 4,
    "losses": 2,
    "form_string": "WWWLLW"
  },
  "head_to_head": [
    {
      "opponent": "Robin Eldin",
      "opponent_id": 1122567,
      "matches": 1,
      "wins": 1,
      "losses": 0
    },
    {
      "opponent": "Yuto Miyagawa",
      "opponent_id": 1159919,
      "matches": 1,
      "wins": 1,
      "losses": 0
    },
    {
      "opponent": "Taiyo Uenoyama",
      "opponent_id": 491801,
      "matches": 1,
      "wins": 1,
      "losses": 0
    },
    {
      "opponent": "Karl Kazuma Lee",
      "opponent_id": 265567,
      "matches": 1,
      "wins": 0,
      "losses": 1
    },
    {
      "opponent": "Ewan Ogura",
      "opponent_id": 288523,
      "matches": 1,
      "wins": 1,
      "losses": 0
    }
  ],
  "upcoming_matches": [],
  "year_statistics": null,
  "data_generated_at": "2026-01-30 14:04:45 UTC"
}