If you're looking for anime similar to Saki, you might like these titles. All recommendations are made by Anime-Planet users like you!
Asuna Harukaze is a girl who loves tennis to the point where she practices her swings with a pitchfork while working on the family farm. At school she is a member of the Soft Tennis Club along with the enthusiastic Kotone, food-crazy Chitose and bizarre yet talented Kurusu. With a big tournament approaching, the girls are taking practice more seriously than ever, but with Asuna’s strange and perverted logic surfacing at every turn and Chitose’s inability to win a single match, can the club emerge triumphant and make it to the nationals?
First of all, these anime are all about showing how their sports are serious business: be elementary schoolers' basketball or high-schoolers' mahjong, the characters will do everything to get to the top. You also have the typical but still nice scenes about friendships, mutual trust and overcoming one own problem etc. And they both have a really considerable amount of cutesy comedy and slightly ambiguous moments.
Only true difference is that Ro-Kyu-Bu is filled with lolis, so be warned if you're not into it, while Saki has absurd "transformations" during matches; anyway, I still think this makes for a good recommendation.