This manga is quite old--it's from 1957. It centers around three members of the table tennis club at an all-girl school. Though it may not quite be yuri, it's a precursor to current yuri manga.

Takahashi Makoto's The Rows of Cherry Trees is quite old—it's from 1957. It centers around three members of the table tennis club at an all-girl school. The story begins with the school tournament, where Yukiko faces off against first her rival, then her crush.
(Source: lililicious)