Matthew Pouliot of Hardball Talk wrote a nice recollection of the journeyman pitcher's finest game:
But let’s go back to 1995 for a moment. On Sept. 25, Castillo was making his next to last start of the Cubs’ abbreviated season. Three weeks earlier, he had pitched a five-hit shutout against the Rockies. But on Sept. 25, facing the Cardinals, he had something even more special in store. With his wife watching on, Castillo took a no-hitter into the bottom of the ninth, losing it only when Bernard Gilkey delivered a triple on a 2-2 fastball with two outs, Sammy Sosa dove for the ball in right field, but came up a bit short.
“It was one of those pitches that as soon as I threw it, I wanted it back,” Castillo told the Chicago Tribune’s Paul Sullivan afterwards. “Sammy made a great effort. He almost made it.”
He still pitched a 13-strikeout one-hitter. The fact that the lone knock was a triple must make this one-hitter unique and thanks to the Baseball-Reference Play Index I found that it is. There have been exactly 100 one-hit shutouts since that day (including two from the postseason) and Castillo's is the last in which the hit was a three-bagger. Of the 685 one-hit shutouts (681 reg. season) since 1916, only 11 featured a triple:
|Frank Castillo||1995-09-25||CHC||STL||W 7-0||9.0||1||0||0||2||13||114||78||96||1||Bernard Gilkey top 9, 2 outs|
|Danny Darwin||1993-08-18||BOS||CHW||W 5-0||9.0||1||0||0||2||2||94||62||85||1||Dan Pasqua top 8, 1 out|
|Zane Smith||1991-05-29||PIT||STL||W 6-0||9.0||1||0||0||1||5||89||62||89||1||Jose Oquendo bot 3, 1 out|
|Teddy Higuera||1987-09-01||MIL||KCR||W 2-0||9.0||1||0||0||2||9||92||1||Ross Jones bot 8, 2 out|
|Jimmy Jones||1986-09-21||SDP||HOU||W 5-0||9.0||1||0||0||0||5||90||1||Bob Knepper bot 3, 2 out|
|Terry Leach||1982-10-01||NYM||PHI||W 1-0||10.0||1||0||0||6||7||91||1||Luis Aguayo bot 5, 1 out|
|Rich Gale||1978-06-13||KCR||TEX||W 5-0||9.0||1||0||0||6||4||83||1||Al Oliver top 7, 2 out|
|Dennis Eckersley||1977-08-12 (1)||CLE||MIL||W 2-0||9.0||1||0||0||0||8||93||1||Cecil Cooper top 1, 2 out|
|Jim Hannan||1970-08-17||WSA||KCR||W 7-0||9.0||1||0||0||2||6||89||1||Paul Schaal top 5, 2 out|
|Bobo Newsom||1942-05-06||WSH||DET||W 7-0||9.0||1||0||0||4||4||85||1||Doc Cramer top 3|
|Wilbur Cooper||1919-08-08||PIT||BRO||W 3-0||9.0||1||0||0||3||2||84||1||Ivy Olson top 1, 0 out|
No one was a strike away from a no-hitter like Castillo was, but Danny Darwin and Teddy Higuera took bids into the eighth and Rich Gale took his into the seventh. The 1986 game by Jimmy Jones is notable in that the triple he gave up was to Bob Knepper the opposing pitcher! Terry Leach's game in 1982 was a 10-inning shutout, the last by a Met.
There's no play-by-play data for the Bobo Newsom and Wilbur Cooper games, but I was able to find this Pittsburgh Press report that said when Cramer hit his triple. Also, thanks to parts of The Neyer/James Guide to Pitchers showing up on Google Books, I was able to find that the triple hit off Cooper led off the game!