Major league batters set a record in May for most home runs in any month. Batters hit 1,135 home runs in May, topping the previous mark of 1,119 in August 2017, according to the Elias Sports Bureau. Milwaukee's Christian Yelich led the big leagues with 21 homers through the end of May, followed by the Los Angeles Dodgers' Cody Bellinger with 20 and New York Mets rookie Pete Alonso with 19.