Cross Game has a female playing baseball.
Itsumo Misora has various sports.
Mahou Sensei Negima! has a lot of girls involved in sports, though none of them are the main ones.
Major, the main love interest of the lead char is playing baseball -> softball
No Side has a male switching gender and continuing on in a female body.
Touch, the main female goes gymnastics.
Wind Mill is about softball playing females
Awasete Ippon has a girl doing judo as the lead.
Crazy Girl has a girl playing tennis, I think.
The main romantic interest in
Prince of Tennis is a tennis player.
The Cherry Project is about pair ice skating.
Buzzer Beater has a female basketball player.
Rough has a female diver.
I'm not sure but I think
Inu Neko Jump had a female jumper.
Break Shot's image contains a girl with a billiard staff/stick/whatever.
I think I avoided mentioning anything mentioned before.