A few of my personal favourites:
Sports +
romance:
Touch
A very moving series about the growth of a trio of childhood friends as they bring their highschool's baseball team ever closer to Koshien Stadium. The original mangaka Adachi Mitsuru has also written several other sports series, including H2 (baseball), Katsu (boxing) and Rough (swimming).
Sports +
female main character:
Yawara, Fashionable Judo Girl
"Inokuma Yawara is just another young high school girl. Well, not quite - for Yawara is being raised by her grandfather, 7th dan Judo master Inokuma Jigorou, to be Japan's great hope for the women's Judo competition at the 1992 Olympics in Barcelona. All the same, Yawara just wants to live a normal life..."
Sports +
supernatural element?:
Hikaru no Go
The ghost of an ancient Go master haunts the game board belonging to a young boy. Together they strive to play to perfect game of Go, and achieve the "Hand of God".