<P> Sportscasters also use the term "walk - off hit" as any kind of hit which drives in the winning run to end the game . The terms "walk - off hit by pitch", "walk - off walk" (a base on balls with the bases loaded), "walk - off wild pitch", "walk - off reach - on - error", "walk - off steal of home", "walk - off passed ball", and "walk - off balk" have been also applied, and the latter has been dubbed a "balk - off". It is a separate stretch of the term to call a hit a walk - off when what ends the game is not the hit but the defense's failure to make a play (as in a single with a possible out at the plate). The day after Eric Bruntlett pulled off a game - ending unassisted triple play for the Philadelphia Phillies against the New York Mets on August 23, 2009, the Philadelphia Daily News used the term "walk - off triple play" in a subheadline describing the moment . </P> <P> A grand slam is a home run hit with all three bases occupied by baserunners ("bases loaded"), thereby scoring four runs--the most possible in one play . A walk - off home run with the bases loaded is therefore known as a walk - off grand slam . </P> <P> Starting in the 1990s, a walk - off grand slam that erases a three - run deficit has come to be known as an ultimate grand slam . There have been 29 such instances documented in major league history--all taking place during the regular season, 15 of those coming with two outs . Of the 29 home runs, only Roberto Clemente's was hit inside the park, at spacious Forbes Field on July 25, 1956 . Pirates manager / third base coach Bobby Bragan instructed him to stop at third, but Clemente ran through the stop sign to score the winning run . Alan Trammell's June 21, 1988 and Chris Hoiles' May 17, 1996 grand slams occurred under the cliché situation: bases loaded, two outs, full count, bottom of the ninth inning, and down by three runs . The most recent ultimate grand slam was hit by David Bote of the Chicago Cubs on August 12, 2018 . Three players have hit two walk - off grand slams in a season, Cy Williams in 1926, Jim Presley in 1986, and Steve Pearce in 2017 . Pearce's first was on July 27 (an 8--4 victory over the Oakland Athletics). followed by his second on July 30 (an ultimate grand slam, for an 11--10 win over the Los Angeles Angels), becoming the first player in MLB history to hit multiple walk - off grand slams within the span of a single week . </P> <P> Only five pitchers in major league history have surrendered two game - ending grand slam home runs in one season, according to the Elias Sports Bureau: </P>

Who has hit a walk off grand slam
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