sentences:  The following day, he hit his first major league home run, a 2-run shot off Seattle Mariners relief pitcher Shawn Kelley.Céspedes had hit his first walk-off home run on June 21 against the Los Angeles Dodgers with the final score of 4–1, resulting in a three-game sweep.The Athletics would go on to win the American League West, with Céspedes batting .316 with a .381 OBP in the postseason.