On September 27, 1963, in a plan undoubtedly hatched by GM Paul Richards to show off the team's youth program, the Colt .45's placed on the Colt Stadium field a starting lineup comprised entirely of rookies. The lineup had an average age of 19 years and 4 months, would feature four future all-stars, and although things got pretty ugly pretty quick, only three Colt players of the eighteen used had seen major league action prior to '63.
It was not a bad time for such an experiment either. Only three games remained in the National League season, and the ninth-place Colts were neither going to be caught by the last-place Mets, nor were they going to catch the eighth-place Pirates. The Colts were not going to lose 100, nor were they going to win 70. And their opponent was coincidentally enough (not!) those same last-place New York Mets.
The original plan had been to start Larry Yellen, but Yellen had asked not to pitch that Friday evening, citing a Jewish holiday. So the ball instead was given to lefthander Dahl, who got the side with no damage done in the first. But in the second he ran into major problems, giving up three runs on three hits and a wild pitch. Dahl came back for the third, but would not finish the inning, and manager Craft brought in another rookie lefty, Coombs, with two gone, to try and stop the bleeding. Instead, Craft got a hemorrhage. Coombs gave up three more hits before finally getting Ron Hunt to line out to second. In the bottom of the inning, the first non-rookie came to the plate, as second year man Johnny Weekly walked as a pinch-hitter for Coombs. But Weekly did not score and after three innings the grand experiment stood at Last Place Mets 8, Colt Rookies 0.
You'd figure it couldn't get worse, and it didn't, either. The Old Man of the Colts that day, 26 year 10 month old Joe Hoerner, came in in the fourth and pitched three scoreless innings. For the rest of the game, the Colts actually outscored the Mets 3 - 2. Veteran Carl Warwick pinch hit for Jim Dickson in the eighth, and second year man Ernie Fazio replaced Vaughan in a double switch late.
Note that Colt pitchers combined for two walks, and the Colt lineup combined for 11 hits (all but Morgan's ninth-inning triple were singles, though). The game was as one-sided as it looks, but there were flashes of competency by the extremely young future major leaguers assembled.

New York Mets AB R H RBI Joe Christopher rf 4 0 0 0 Dick Smith cf 5 1 1 0 Ron Hunt 2b 5 1 1 1 Ted Schreiber 2b 0 0 0 0 Frank Thomas lf 5 1 2 0 Rod Kanehl lf 0 0 0 0 Jim Hickman 3b 5 1 3 1 Tim Harkness 1b 5 2 1 0 Ed Kranepool 1b 0 0 0 0 Chris Cannizzaro c 4 2 1 2 Al Moran ss 5 2 3 2 Al Jackson p 5 0 2 1             Mets totals 43 10 15 9

Age Houston Colt .45's Y M D AB R H RBI Sonny Jackson, ss 19 2 18 3 0 0 0 Ernie Fazio 3b 21 8 2 1 1 0 0 Joe Morgan 2b 20 0 8 5 0 2 1 Jimmy Wynn cf 21 6 15 4 0 2 0 Rusty Staub 1b 19 5 27 5 1 2 1 Aaron Pointer rf 21 5 8 5 0 1 0 Brock Davis lf 19 11 22 5 0 1 1 Glenn Vaughan ss-3b 19 7 12 4 0 2 0 Jerry Grote c 20 11 21 4 0 1 0 Dave Adlesh c 20 2 12 0 0 0 0 Jay Dahl p 17 9 21 0 0 0 0 Dan Coombs p 21 6 4 0 0 0 0 Johnny Weekly ph 26 3 13 0 0 0 0 Joe Hoerner p 26 10 15 1 0 0 0 Mike White ph 24 9 9 1 0 0 0 Jim Dickson p 25 5 7 0 0 0 0 Carl Warwick ph 26 7 0 1 0 0 0 Dick Drott p 24 9 9 1 0 0 0 Colt .45 totals   39 3 11 3

	1	2	3	4	5	6	7	8	9
New York Mets	0	3	5	0	0	0	1	0	1
Houston Colt .45's	0	0	0	1	1	0	0	0	1

E     - Davis 2, S. Jackson, Hickman, Harkness
LOB- New York 8 Houston 12
2B   - Hunt, Hickman, Harkness 3B - Morgan
SF    - Cannizzaro