Isaac Mattson

#72 Active

RP ● Pittsburgh Pirates ● 6'2" · 214 lbs ● Bats: R · Throws: R ● Pittsburgh

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Season SV

Season ERA

5.35

Season WHIP

1.60

Season K

Season HLD

Next Matchup vs MIN Sat 1:05 PM ET

DFS Last 5

Game Log

2026 Regular Season

DATE	OPPONENT	DEC	IP	H	R	ER	HR	BB	SO	ERA	WHIP	PC	RESULT
Sep 5	vs. Los Angeles Angels		2.0	4	3	3	0	0	2	5.50	1.61	39	L 6-1
Aug 17	vs. Detroit Tigers		2.0	2	1	1	0	2	1	5.03	1.59	41	L 8-5
Jul 28	vs. Arizona Diamondbacks		0.0	1	0	0	0	0	0	5.06	1.56	3	L 8-7
Jul 25	vs. Chicago Cubs		0.1	4	3	3	0	1	1	5.06	1.53	26	L 11-0
Jul 19	@ Cleveland Guardians		1.0	0	0	0	0	0	1	4.26	1.39	13	W 7-1
Jul 12	vs. Milwaukee Brewers		0.2	1	0	0	0	1	1	4.40	1.43	18	W 5-14
Jul 11	vs. Milwaukee Brewers	HLD	1.0	1	0	0	0	0	0	4.50	1.40	24	W 2-3
Jul 8	vs. Atlanta Braves		1.0	2	1	1	0	0	1	4.66	1.41	12	L 3-0
Jul 5	@ Washington Nationals		1.0	2	0	0	0	0	1	4.50	1.39	12	W 11-5
Jul 3	@ Washington Nationals		1.1	3	4	4	2	1	1	4.67	1.37	37	L 5-9
Jun 30	@ Philadelphia Phillies		0.2	1	0	0	0	0	0	3.51	1.29	9	L 0-8
Jun 27	vs. Cincinnati Reds		1.0	0	0	0	0	0	2	3.60	1.28	13	L 9-7
Jun 26	vs. Cincinnati Reds		1.0	0	0	0	0	0	1	3.75	1.33	12	L 6-4
Jun 23	vs. Seattle Mariners		1.0	0	0	0	0	0	1	3.91	1.39	13	L 3-2
Jun 17	@ Las Vegas Athletics		1.0	1	1	1	1	0	2	4.09	1.45	16	W 12-4
Jun 14	vs. Miami Marlins		1.1	0	0	0	0	2	1	3.86	1.48	27	L 4-2
May 17	vs. Philadelphia Phillies		1.0	1	0	0	0	0	0	4.12	1.47	15	L 6-0
May 16	vs. Philadelphia Phillies		1.1	0	0	0	0	1	2	4.34	1.50	25	L 6-0
May 10	@ San Francisco Giants	BS	0.1	3	2	2	0	0	0	4.67	1.56	18	L 6-7
May 7	@ Arizona Diamondbacks	HLD	0.1	0	0	0	0	0	1	3.71	1.41	6	W 4-2
Apr 30	vs. St. Louis Cardinals		0.2	3	5	5	0	2	0	3.78	1.44	31	L 10-5
Apr 27	vs. St. Louis Cardinals	HLD	0.1	0	0	0	0	0	1	1.13	1.19	3	L 4-2
Apr 25	@ Milwaukee Brewers	BS	1.0	0	0	0	0	0	0	1.15	1.21	4	W 6-3
Apr 24	@ Milwaukee Brewers		1.0	0	0	0	0	1	1	1.23	1.30	14	W 6-0
Apr 19	vs. Tampa Bay Rays	HLD	1.0	0	0	0	0	0	1	1.32	1.32	8	W 3-6
Apr 18	vs. Tampa Bay Rays		1.0	0	0	0	0	0	0	1.42	1.42	13	L 8-7
Apr 16	vs. Washington Nationals		1.0	0	0	0	0	1	0	1.54	1.54	18	L 8-7
Apr 14	vs. Washington Nationals		2.0	2	0	0	0	0	1	1.69	1.59	33	L 5-4
Apr 11	@ Chicago Cubs	HLD	1.0	2	0	0	0	0	1	2.08	1.73	24	W 4-3
Apr 10	@ Chicago Cubs	HLD	1.0	0	0	0	0	1	0	2.35	1.70	12	W 2-0
Apr 7	vs. San Diego Padres	HLD	0.2	1	0	0	0	0	0	2.70	1.80	9	W 1-7
Apr 6	vs. San Diego Padres		1.0	2	0	0	0	0	2	3.00	1.83	21	L 5-0
Apr 4	vs. Baltimore Orioles		1.0	1	0	0	0	1	1	3.60	1.80	17	W 2-3
Apr 1	@ Cincinnati Reds	HLD	1.1	1	0	0	0	0	0	4.50	1.75	22	W 8-3
Mar 30	@ Cincinnati Reds		1.0	0	0	0	0	1	1	6.75	2.25	15	L 0-2
Mar 29	@ New York Mets		1.0	0	0	0	0	0	2	10.80	3.00	13	W 4-3
Mar 26	@ New York Mets		0.2	3	2	2	0	2	1	27.00	7.50	36	L 7-11
No games against that opponent.
Total		0-0	36.0	41	22	22	3	17	31	5.50	1.61	672
Total	2 games	0-0	0.1	1	0	0	0	0	1	0.00	3.00	9
Total	1 game	0-0	1.0	2	1	1	0	0	1	9.00	2.00	12
Total	1 game	0-0	1.0	1	0	0	0	1	1	0.00	2.00	17
Total	3 games	0-0	2.1	6	3	3	0	2	2	11.57	3.43	62
Total	4 games	0-0	4.1	1	0	0	0	1	4	0.00	0.46	62
Total	1 game	0-0	1.0	0	0	0	0	0	1	0.00	0.00	13
Total	1 game	0-0	2.0	2	1	1	0	2	1	4.50	2.00	41
Total	1 game	0-0	1.0	1	1	1	1	0	2	9.00	1.00	16
Total	1 game	0-0	2.0	4	3	3	0	0	2	13.50	2.00	39
Total	1 game	0-0	1.1	0	0	0	0	2	1	0.00	1.50	27
Total	4 games	0-0	3.2	2	0	0	0	2	2	0.00	1.09	60
Total	2 games	0-0	1.2	3	2	2	0	2	3	10.80	3.00	49
Total	3 games	0-0	3.0	2	0	0	0	1	2	0.00	1.00	49
Total	2 games	0-0	1.2	3	0	0	0	0	2	0.00	1.80	30
Total	1 game	0-0	0.1	3	2	2	0	0	0	54.00	9.00	18
Total	1 game	0-0	1.0	0	0	0	0	0	1	0.00	0.00	13
Total	2 games	0-0	1.0	3	5	5	0	2	1	45.00	5.00	34
Total	2 games	0-0	2.0	0	0	0	0	0	1	0.00	0.00	21
Total	4 games	0-0	5.1	7	4	4	2	2	3	6.75	1.69	100

AVG, OBP, SLG, ERA and WHIP are season-to-date through each game, not that game alone — so the column reads as a trend and its last value is the season figure. They stay season-to-date when the log is filtered by opponent; the figure for the filtered games is the one in the Total row. The second game of a doubleheader is marked (2).