From Yanime:

A boy named Yuuto Seo moves from Hokkaido, where he's lived all his life, to Tokyo. He first fears he must give up speed skating, his hobby, but he soon finds places to skate and people to skate with. The second series written by Hotta Yumi (creator of Hikaru no Go).

One day a young girl finds out that the boy she likes is going to transfer to a different school. The only one who knows how much she loves him is her diary.

Madoka is in love with the girly manager of her basketball team, Yuma. As she's having more and more trouble keeping her feelings in check, Yuma does something that starts a fight between the two. Will their feelings overcome the fight...?

Youth wait for the big wave. They share stories of life, healing and love, the many gifts of surfing. Raw: http://webtoon.daum.net/webtoon/view/GirlWalkingWaves

This is a story of a boy who challenges free diving.
"Free diving (skin diving)" may remind you of the film "Le Grand Bleu." It is an extreme sport, and each meter added to its record brings us closer to the sea bed and further from the surface where one can breathe again. In this sense, free diving has a direct connection with death, with which our fight continues, refashioned over time, bit by bit.
So, why would one free dive, and risk his life? The answer lies within the mysterious bond between the sea and human kind.
And in the fast evolving world of competitive diving, new data emerges that casts light on this bond.

Mizuno Kaori attends an all-girls high school and likes to spend time with her friends after class playing soccer. They'd like to create a club, but they're one member short of creating a team and people think it's foolish for girls to play soccer. Studying at the same high school, Umezawa Hikari is very popular among the boys but doesn't talk much. What most people don't know is that she plays soccer pretty well and dreams of becoming a national player competing in the World Cup. She then joins Kaori's group with plans to challenge a boy's soccer team from another high school. If they can defeat the boy's team, then they can let people know that they really mean business and this will also serve as a small step towards her dream.

Ery was living her ordinary, dull high school life until one day when she saw a guy in the park. Curiosity made her follow after him, and she reached a skating school. Unhesitatingly, she joins the school, but…

Contains an unrelated story Summer Fairytales aka Summer's Fairy Tale (also included in Bathroom Guuwa as chapter 3).

Giant Step is a shounen, sports comedy. With it's relation to Prince of Tennis being in some of the art of attacks and their relation to tennis. If you have already read Prince of Tennis or even a little bit of it and it was too serious for you then Giant Step would be good to check out.

Jeff has been called the 'future star of tennis' from when he was young. However, after a traumatic loss in his childhood, it seems impossible for him to win ever since. Even though he has mastered all of the techniques- serve, smash, volley, footwork- the goal of victory always seems distant.
Tennis is supposed to be about the enjoying the game, not the result. But will Jeff ever overcome his habit of losing at the crucial moment, and achieve victory?

Misono who falls in love with a handsome "boy" one day as she was taking a break from her running. She believes that she shall never meet this "boy" ever again, but after warnings about problems with her foot, Misono decides to not run for a while and help out with the drama club. There she meets her "handsome prince" once again, but it turns out "he" is not who she thought he was...

Asakura Aki is her middle school's track star. She's in love with her neighbor and childhood friend, Shiiba Chihaya. There's news that a transfer student is coming with a track scholarship. Aki doesn't even lose to boys, so they decide to square off in a 100 meter race!

Kingou is a boy with extraordinary powers of concentration. However he doesn't put it to any practical use. He skips class in school, and is mocked by most classmates. Except for one kind girl called Shima. However even the friendly Shima can't get the loner Kingou to interact with his classmates.

An outing with a group of classmates, including one of the popular boys in class and Shima, leads to the astounding discovery that Kingou works at a Billiard hall. An incident with a Hustler leads to Kingou putting his talent of concentration to use, but everything is not as it seems...

In this hot springs, people not only gather to relax and enjoy the hot baths but also gather to compete in intense battles for ping pong. Follow the characters as they make their way through one battle after the other and compete to be the boss of all ping pong!

Tamako, a high school girl, comes to play at the beach with her friends. She gets drunk, and when she awakes next morning, she sees Tomio lying beside her. Now she's in a panic.

Akane Tachibana is a freshman high-school student who, despite his talent for basketball, decides to abandon sports clubs due to the pressure they cause him. Once he arrives at Kouzu High, however, he meets the only other basketball player who has ever caught his eye on the courts and decides to join the team.

The first match of the season is an exhibition game against the league's strongest team, Hyamazaki - the team that Hiiragi's father coaches and in which his older brother plays for. Hiiragi ends up playing in the second half of the game, and they seem to not be working well together on the court, losing the game, until unintentionally one of the senior players on the team challenges them to beat him. They join forces, inspiring the team to victory.

Thus starts the story of a group of teenagers working to reach the top, fighting tooth and nail the entire way.

Akaboshi Taka is a 16-year-old boy who loves to play soccer. After being abandoned by his father, he tries to find a job to support himself. His dream is to become a professional soccer player and he goes to every professional club in Japan to try his luck. (From Manga-Updates)

From Chibi Manga:

Ever since she was young, Chouko has dedicated herself to kendo. Upon entering high school she naturally applies to join the Kendo Cub however, after not being taken seriously, events take an unexpected turn when she stumbles into a boy called Takanashi.

Tachikawa Tetsuya in an incoming freshman at a new high school and he’s a great archer. He wants to join the archery club to meet the one they call “Kami no Ko”, better known as Fudou Gonzaburou. Tachikawa is good, but he’s heard that Fudou is even better. The archery team at this school is in fact very good.

Tachikawa also meets a pretty girl who is already a member of the club (he accidentally walked in on her while she was changing). She’s not very good from the look of things, but she is his senpai and he defers to her. She takes an immediate liking to him and kisses him after practice.

Let’s try just to get past the fact that this girl is actually a boy, named Fudou Gonzaburou…

From Fate:

Mayu, a young stylist is dumped by her boyfriend, thus she needs to find a new home. She makes an aquaintance with her neighbor, Yuka Shimizu, a lonely girl with a very particular dream, to become a free-fight champion despite her small stature.

Talks about a young man that used to be nothing. One day he was fortunate enough to see an inspiring event happen, which will change the lives of him and other witnesses