NintendoPie on 16 July 2013
The simple answer is that these sports were already done in Wii Sports. (And again in Wii Sports Resort. For Golf, anyway.)
I see people arguing the fact that simple "mini-games" in Wii Sports or Tiger Woods Golf wouldn't affect Mario Golf/Tennis, but it would. The "casual" audience that Nintendo targeted with Wii Sports (and that EA targeted with Tiger Woods) wouldn't see why they would need another Golf/Tennis game, just because Mario was in it.
