答:戴維斯杯,或國際網(wang)聯(lian)主辦(ban)的其他正(zheng)式錦標賽(sai)規定,端線以外至(zhi)少要有6.40米(21英尺(chi))的空(kong)(kong)地,邊(bian)(bian)線以外至(zhi)少要有3.66米(12英尺(chi))的空(kong)(kong)地。司線員(yuan)座椅(yi)可安置(zhi)在球場后面6.40米(21英尺(chi))的空(kong)(kong)地內(nei),或安置(zhi)在球場旁邊(bian)(bian)3.66米(12英尺(chi))的空(kong)(kong)地內(nei),只要座椅(yi)凸出該區不超過0.914(3英尺(chi))即可。