Mattson allowed two hits while striking out two in one inning on Monday in a 5-0 loss to the Padres. Mattson was a revelation out of the bullpen for the Pirates last season posting a 2.45 ERA in 44 appearances after only making seven appearances before being called up in May. The right-hander has had a heavy workload so far pitching in six out of Pittsburgh's 10 games posting a 3.00 ERA and seven strikeouts. The Pirates bullpen does not have many proven right-handers other than Dennis Santana, which means Mattson could continue appearing in many games this season.
Isaac Mattson: Everything you need to know
Unlock the latest Pittsburgh Pirates news — direct to your inbox.
Status
ACTIVESTATS
Isaac Mattson Game Log 2026
-
PreseasonDateOppResultIPKBBHBPCGSHOHRER3/21W 8-31.0100000003/16L 5-11.0110001003/14W 8-61.0200000003/9W 5-31.1100000003/6L 14-101.0100001002/27W 6-11.0200000002/22W 7-41.000000000
Preseason Totals 7.181000200 -
Regular SeasonDateOppResultIPKBBHBPCGSHOHRER4/27L 4-20.1100000004/25W 6-31.0000000004/24W 6-01.0110000004/19W 6-31.0100000004/18L 8-71.0000000004/16L 8-71.0010000004/14L 5-42.0100002004/11W 4-31.0100002004/10W 2-01.0010000004/7W 7-10.2000001004/6L 5-01.0200002004/4W 3-21.0110001004/1W 8-31.1000001003/30L 2-01.0110000003/29W 4-31.0200000003/26L 11-70.212000322
Regular Season Totals 14.61270001222
Isaac Mattson Splits 2026
-
SplitsGSIPWLERAKBBHBPCGHRERSVOSAVGHR
Overall 016.0000.0127001222100.2110Home 08.0000.06200600000.2140Away 08.0000.06500622100.2070Night 07.0000.06200500100.2080Day 09.0000.06500722000.2120vs Righty 00.0000.05200810000.2580vs Lefty 00.0000.07500410000.1540March 02.2000.04300322000.2730April 013.1000.08400900100.1960Opponent vs NYM 0 1.2 0 0 0.0 3 2 0 0 3 2 2 0 0 0.375 0 vs WSH 0 3.0 0 0 0.0 1 1 0 0 2 0 0 0 0 0.200 0 vs MIL 0 2.0 0 0 0.0 1 1 0 0 0 0 0 1 0 0.000 0 vs TB 0 2.0 0 0 0.0 1 0 0 0 0 0 0 0 0 0.000 0 vs CHC 0 2.0 0 0 0.0 1 1 0 0 2 0 0 0 0 0.250 0 vs BAL 0 1.0 0 0 0.0 1 1 0 0 1 0 0 0 0 0.333 0 vs CIN 0 2.1 0 0 0.0 1 1 0 0 1 0 0 0 0 0.125 0 vs STL 0 0.1 0 0 0.0 1 0 0 0 0 0 0 0 0 0.000 0 vs SD 0 1.2 0 0 0.0 2 0 0 0 3 0 0 0 0 0.375 0 Venue @ Pittsburgh 0 8.0 0 0 0.0 6 2 0 0 6 0 0 0 0 0.214 0 @ Chicago 0 2.0 0 0 0.0 1 1 0 0 2 0 0 0 0 0.250 0 @ Cincinnati 0 2.1 0 0 0.0 1 1 0 0 1 0 0 0 0 0.125 0 @ New York 0 1.2 0 0 0.0 3 2 0 0 3 2 2 0 0 0.375 0 @ Milwaukee 0 2.0 0 0 0.0 1 1 0 0 0 0 0 1 0 0.000 0
Isaac Mattson Player Profile
Career History
Isaac Mattson: Breaking News
Solid in high-leverage spot
Mattson allowed one hit and struck out three across 1.2 scoreless innings to earn a hold Monday against the Brewers. The Pirates deployed a bullpen approach Monday, and Mattson was tasked with holding the lead in the seventh and eighth innings. He faced the top five hitters in the Brewers' order and allowed only a single to William Contreras. Mattson could be a candidate to see more consistent high-leverage spots moving forward, as he delivered a 9:2 K:BB across 10.1 innings while allowing only two earned runs with a 0.58 WHIP since being recalled June 7.
Recalled by Pittsburgh
The Pirates recalled Mattson from Triple-A Indianapolis on Saturday. Mattson has appeared in three games for the Pirates this season, but he has spent most of the year in Triple-A, where he has a 2.42 ERA, 0.95 WHIP, four saves and a 27:6 K:BB across 22.1 innings. He'll take the spot in the Pirates' bullpen vacated by Joey Wentz, who was designated for assignment in a corresponding move.