Mel Ott has the most career games by a player younger than 27, with 1,288 games.

Interpreted as:

most regular-season games played by a player under 27 years old

	NAME	G	AB	R	H	2B	3B	HR	RBI	BB	HBP	SO	SB	CS	PA	TB	XBH	SH	SF	IBB	GIDP	AVG	OBP	SLG	OPS
1	Mel Ott M. Ott	1,288	4,542	912	1,440	257	47	242	963	707	24	359	45		5,332	2,517	546	59				.317	.412	.554	.966
2	Robin Yount R. Yount	1,224	4,780	660	1,338	252	53	90	533	279	9	519	114	51	5,181	1,966	395	70	43	15	83	.280	.318	.411	.729
3	Al Kaline A. Kaline	1,204	4,505	714	1,390	226	45	159	694	474	23	378	84	39	5,070	2,183	430	28	40	46	123	.309	.374	.485	.859
4	Andruw Jones A. Jones	1,152	4,170	687	1,118	219	25	224	684	440	44	879	118	43	4,696	2,059	468	6	36	31	94	.268	.342	.494	.835
5	Rusty Staub R. Staub	1,151	4,024	484	1,114	205	24	116	543	545	33	465	23	21	4,678	1,715	345	42	34	97	93	.277	.365	.426	.791
6	Adrian Beltre A. Beltre	1,126	4,082	527	1,106	212	19	166	597	324	32	701	67	27	4,485	1,854	397	13	34	38	91	.271	.327	.454	.781
7	Cesar Cedeno C. Cedeno	1,111	4,265	689	1,245	257	41	135	594	365	40	556	374	112	4,724	1,989	433	14	40	50	94	.292	.350	.466	.817
8	Jimmie Foxx J. Foxx	1,109	3,862	857	1,307	224	72	266	961	668	7	545	42		4,592	2,473	562	55				.338	.437	.640	1.077
9	Mickey Mantle M. Mantle	1,102	3,937	889	1,238	185	50	249	766	797	7	778	76	24	4,768	2,270	484	11	16	48	37	.314	.429	.577	1.006
10	Bill Mazeroski B. Mazeroski	1,098	3,966	434	1,056	162	39	83	446	230	11	393	13	11	4,287	1,545	284	49	31	51	87	.266	.306	.390	.696
11	Johnny Bench J. Bench	1,094	4,065	612	1,096	197	17	212	745	451	11	643	29	26	4,587	1,963	426	5	55	83	111	.270	.340	.483	.823
12	Freddie Lindstrom F. Lindstrom	1,088	4,241	704	1,347	212	63	91	603	263	10	214	80		4,617	1,958	366	103				.318	.359	.462	.821
13	Bryce Harper B. Harper	1,084	3,879	708	1,071	219	19	219	635	684	29	1,012	90	34	4,639	1,985	457	9	38	81	76	.276	.385	.512	.897
14	Vada Pinson V. Pinson	1,073	4,367	732	1,315	238	70	143	600	305	24	582	157	57	4,735	2,122	451	13	26	20	78	.301	.348	.486	.834
15	Cass Michaels C. Michaels	1,070	3,674	421	965	124	44	34	415	460	19	321	47	1	4,208	1,279	202	55			106	.263	.348	.348	.696
16	Ruben Sierra R. Sierra	1,060	4,144	588	1,160	230	44	156	673	298	7	597	88	33	4,512	1,946	430	1	62	51	91	.280	.325	.470	.794
17	Ken Griffey Jr. K. Griffey Jr.	1,057	3,985	695	1,204	227	21	238	725	504	25	634	108	44	4,558	2,187	486	6	38	119	75	.302	.381	.549	.930
18	Alex Rodriguez A. Rodriguez	1,054	4,148	838	1,285	247	16	273	813	443	53	823	157	42	4,703	2,383	536	16	43	20	89	.310	.380	.574	.954
19	Ron Santo R. Santo	1,053	3,921	526	1,108	189	43	167	618	479	19	590	22	21	4,465	1,884	399	8	38	43	107	.283	.360	.480	.841
20	Ed Kranepool E. Kranepool	1,052	3,351	329	839	130	20	76	353	266	11	395	9	23	3,684	1,237	226	27	29	51	74	.250	.305	.369	.674
21	Miguel Cabrera M. Cabrera	1,051	3,963	637	1,235	255	12	211	764	454	33	829	24	15	4,491	2,147	478	5	36	90	127	.312	.384	.542	.926
22	Aurelio Rodriguez A. Rodriguez	1,049	3,855	378	912	166	31	70	358	203	20	582	32	22	4,129	1,350	267	30	21	30	92	.237	.277	.350	.627
23	Orlando Cepeda O. Cepeda	1,049	4,046	642	1,254	223	22	221	743	245	48	607	92	47	4,377	2,184	466	1	37	61	110	.310	.354	.540	.893
24	Richard Hoblitzell R. Hoblitzell	1,043	3,796	481	1,084	157	80	26		307	28		149		4,295	1,479	263	164				.286	.344	.390	.733
25	Starlin Castro S. Castro	1,042	4,101	454	1,147	215	32	83	433	210	31	705	79	45	4,374	1,675	330	7	25	25	121	.280	.318	.408	.726