This is a list episodes for the Japanese anime series, Big Windup!. The English titles for the first season are according to the names used by Funimation Entertainment. English titles in the other seasons are not official.
The first season, produced in 2007, was entitled Ōkiku Furikabutte (おおきく振りかぶって?). It was produced by the Japanese animation studio A-1 Pictures and directed by Tsutomu Mizushima. It was released in English by Funimation under the title Big Windup! – Oofuri. The series contains 25 episodes which aired between April 12 and September 27 on a number of Japanese television networks including TBS, MBS, BS-i, and CBC. An additional special episode based on the one shot "The Basic of Basics" was only included in the 9th volume of the DVD's.
The story follows the story of Ren Mihashi, a pitcher who was blamed by his middle school team for their string of losses, and as a result suffers from low self-esteem and transfers to a different high school. There, the school's first baseball team is being formed and Mihashi reluctantly joins as their Ace Pitcher. Assisted by his new teammates (and especially the catcher, Takaya Abe), he grows in stature, confidence and skill, helping his team excel with his own abilities. There are two opening and ending theme songs for the series. The first is "Dramatic" (ドラマチック? Doramachikku), sung by Base Ball Bear, and the second is "Seishun Line" (青春ライン), by Ikimonogakari. "Medaka no Mita Niji" (メダカの見た虹), performed by Kozue Takada, is the first ending theme, and the second is "Arigatō" (ありがとう), by SunSet Swish.