Hudi's always had health problems, stemming from the removal of a lung when he was really young.  His health concerns are compounded by his weight, and his doctor advices his parents to get him into sports. But, Hudi would much rather tell jokes and make people laugh than run or diet.  Enter Chunky, Hudi’s imaginary mascot, here to cheer on Hudi as he tries out several sports: baseball, where he can only get on base if he's struck by the ball; soccer, where he has some success using his large stature in the role of goalie;  swimming, which he really enjoyed until he hurt his thumb and can't get it wet; and football, where the agression of the sport clashes with Hudi's jovial nature. Complicating things is a strained relationship with his father, who is extremely athletic. 

One arm of manga publishing that has been popular for decades is Sports Manga.  These are mostly popular with the gentlemen readers, but I have seen a number of  young ladies gravitate towards sports manga.  There are so many titles encompassed in this genre, and a lot of the good ones are really hard to find now (Initial D comes to mind, which was published by TokyoPop, so good luck finding those).  New series are coming out all the time in this area, so check with your readers to see which ones they might be interested in.
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As the title gives away, this series is about a tennis player.  Ryoma Echizen is no ordinary tennis player.  He's only 12 years old, but he's good enough to compete in the 16-year-old tournament and wipe the floor with all of them.  How can this pip-squeak be so good??  Well, his dad was a major tennis star, and his talent was genetically passed on to his son.  The Prince of Tennis is a title others have pushed on Ryoma, and each volume is filled with ways he has to prove to others that he is worthy of that title.  Ryoma also enrolls in an Academy for rising tennis stars, so the pressures of school are added to the demands of tennis-playing.