Don Mattingly set two home run records in 1987: homered in 8 consecutive games, including 2 of record 6 grand slams.

Don Mattingly

Home runs in 8 consecutive games:

102	102	9	1	1987-07-08	NYY		MIN	Mike Smithson	behind 0-1	b 1	0	12-		3	3	3	0.182	73%		Home Run; Henderson Scores; Ward Scores
103	103	10	2	1987-07-08	NYY		MIN	Juan Berenguer	ahead 7-4	b 6	0	---		1	3	3	0.041	95%		Home Run
104	104	11	1	1987-07-09	NYY		CHW	Richard Dotson	behind 1-5	b 6	2	---		1	3	3	0.053	12%		Home Run
105	105	12	1	1987-07-10	NYY		CHW	Joel McKeon	tied 2-2	b 2	1	123		4	3	3	0.213	86%		Home Run; Cerone Scores; Henderson Scores; Randolph Scores
106	106	13	1	1987-07-11	NYY		CHW	Jose DeLeon	behind 0-2	b 3	2	---		1	3	3	0.105	39%		Home Run
107	107	14	1	1987-07-12	NYY		CHW	Jim Winn	ahead 5-2	b 7	2	---		1	3	3	0.036	96%		Home Run
108	108	15	1	1987-07-16	NYY	@	TEX	Charlie Hough	ahead 2-0	t 2	2	123		4	3	3	0.204	91%		Home Run; Salas Scores; Tolleson Scores; Washington Scores
109	109	16	2	1987-07-16	NYY	@	TEX	Mitch Williams	ahead 9-3	t 8	2	1--		2	3	3	0.008	100%		Home Run; Washington Scores
110	110	17	1	1987-07-17	NYY	@	TEX	Paul Kilgus	ahead 6-1	t 6	2	---		1	3	3	0.026	96%		Home Run
111	111	18	1	1987-07-18	NYY	@	TEX	Jose Guzman	behind 0-2	t 4	0	---		1	3	3	0.103	38%		Home Run (Fly Ball to Deep LF)

In games one and six Mattingly hit two home runs.  In games three and six Mattingly hit a home run with the bases loaded.

Mattingly hit the only bases loaded home runs of his career in 1987, a record six.  Mattingly hit grand slams:
May 14 TEX Mike Mason
June 29 @TOR John Cerutti
July 10 CWS Joel McKeon
July 16 @TEX Charlie Hough
Sept. 25 @BAL Jose Mesa
Sept. 29 BOS Bruce Hurst

Mattingly hit 30 homers in 1987, ten in the eight consecutive games in which Mattingly hit at least one home run.