Hard court | Clay court | |
---|---|---|

Mean (SD) | Mean (SD) | |

Of the two players contesting each match, values (mean (SD)) represent those of only the player participating in the investigation (n = 6). Values in parentheses (n) represent the number of data from which mean and SD are derived. | ||

First serve velocity (kph) | 178 (9) | 172 (14) |

(n = 445) | (n = 375) | |

Second serve velocity (kph) | 135 (10) | 134 (12) |

(n = 199) | (n = 147) | |

First serve accuracy (%) | 56 (24) | 55 (24) |

Points won on first serve (%) | 72 (33) | 76 (25) |

Points won on second serve (%) | 63 (34) | 61 (35) |

Unforced errors (%) | 24 (13) | 24 (17) |