← Arizona Diamondbacks
Jonathan Loaisiga
Arizona Diamondbacks
RP · #43 · Bats R · Throws R · 5'11" · 195 lb · Age 31 · 9 yrs in MLB
2026 grade
87.6
- Runs prevented
- +10.7
- IP · ERA
- 67.0 · 2.42
- K · BB
- 48 · 13
- Rank
- 26 of 205 relievers
What the grade is made of
Runs each part saves or costs against an average pitcher facing the same batters. Contact counts a quarter for how it turned out, because over a season that's mostly the fielders and luck.
- Home runs allowed3 vs 8 avg+6.7
- Walks10 vs 22 avg+3.9
- Strikeouts48 vs 57 avg−2.5
- Contact allowed (how it turned out counts a quarter)194 vs 166 avg+1.7
- Hit batters1 vs 3 avg+0.7
- Parks pitched in+0.1
2026 game log: pitching
Game grades need 3 batters faced; starts are ranked against starts, relief outings against relief outings.
| Game | Result | Dec | IP | H | R | ER | BB | K | HR | PC | Grade |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Sat, Sep 26@SD | L 7-10 | 2.0 | 1 | 2 | 2 | 1 | 1 | 0 | 24 | 66.6 | |
| Wed, Sep 23@COL | W 5-3 | S | 1.0 | 1 | 0 | 0 | 1 | 0 | 0 | 16 | 46.5 |
| Sun, Sep 20vsNYY | W 8-4 | 2.0 | 1 | 0 | 0 | 0 | 0 | 0 | 22 | 89.6 | |
| Wed, Sep 16vsMIA | L 3-4 | 1.0 | 2 | 0 | 0 | 0 | 1 | 0 | 9 | 28.0 | |
| Mon, Sep 14vsMIA | W 8-7 | 1.1 | 2 | 0 | 0 | 0 | 2 | 0 | 23 | 47.4 | |
| Sat, Sep 12vsTEX | L 2-6 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | – | |
| Tue, Sep 8@KC | W 5-3 | H | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 12 | 87.4 |
| Sun, Sep 6@HOU | W 3-2 | H | 1.0 | 3 | 1 | 1 | 0 | 2 | 0 | 19 | 15.4 |
| Sat, Sep 5@HOU | W 4-3 | W | 1.0 | 1 | 0 | 0 | 0 | 2 | 0 | 17 | 56.3 |
| Wed, Sep 2vsPHI | W 1-0 | W | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 83.1 |
| Mon, Aug 31vsPHI | L 1-2 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 14 | 81.8 | |
| Fri, Aug 28@SF | W 10-6 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 10 | 71.5 | |
| Thu, Aug 27@SF | L 1-6 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 9 | 71.5 | |
| Sun, Aug 23vsCIN | W 5-3 | W | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 12 | 57.2 |
| Wed, Aug 19@BOS | W 7-6 | W | 2.0 | 1 | 1 | 0 | 0 | 0 | 0 | 16 | 90.3 |
| Tue, Aug 18@BOS | L 4-9 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 9 | 46.1 | |
| Sat, Aug 15@ATL | W 10-3 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | 79.1 | |
| Sat, Aug 8vsLAD | L 1-2 | 1.0 | 3 | 1 | 1 | 0 | 2 | 1 | 30 | 6.8 | |
| Thu, Aug 6vsSD | L 1-5 | 1.1 | 0 | 0 | 0 | 0 | 2 | 0 | 18 | 93.6 | |
| Tue, Aug 4vsSD | L 4-9 | 1.0 | 2 | 1 | 1 | 1 | 0 | 0 | 12 | 18.4 | |
| Sat, Aug 1@CLE | W 12-8 | 1.0 | 2 | 1 | 1 | 0 | 0 | 0 | 18 | 18.8 | |
| Fri, Jul 31@CLE | W 4-1 | W | 1.0 | 0 | 0 | 0 | 1 | 1 | 0 | 17 | 64.5 |
| Mon, Jul 27@PIT | L 2-3 | B | 1.0 | 2 | 1 | 1 | 0 | 1 | 0 | 18 | 19.1 |
| Sun, Jul 26@WSH | L 7-10 | L | 1.0 | 2 | 2 | 2 | 0 | 1 | 1 | 16 | 12.8 |
| Wed, Jul 22vsATH | W 15-5 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 8 | 83.7 | |
| Mon, Jul 20vsATH | L 2-5 | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 10 | 57.8 | |
| Sat, Jul 18vsSTL | W 5-3 | H | 0.2 | 1 | 0 | 0 | 1 | 1 | 0 | 15 | 32.2 |
| Sun, Jul 12@LAD | W 5-3 | H | 1.0 | 0 | 0 | 0 | 1 | 2 | 0 | 23 | 63.3 |
| Fri, Jul 10@LAD | W 9-3 | 1.0 | 0 | 0 | 0 | 0 | 2 | 0 | 18 | 77.9 | |
| Tue, Jul 7@SD | L 1-4 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 16 | 74.1 | |
| Sat, Jul 4vsMIL | W 4-3 | H | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 15 | 57.8 |
| Fri, Jul 3vsMIL | L 4-7 | 1.2 | 1 | 0 | 0 | 0 | 1 | 0 | 21 | 68.4 | |
| Wed, Jul 1vsSF | L 4-6 | 1.0 | 2 | 0 | 0 | 0 | 1 | 0 | 16 | 36.0 | |
| Sun, Jun 28@TB | L 1-5 | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 12 | 56.0 | |
| Wed, Jun 24@STL | W 9-4 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 16 | 79.1 | |
| Mon, Jun 22@STL | L 2-3 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | – | |
| Fri, Jun 19vsMIN | W 9-5 | W | 1.1 | 0 | 0 | 0 | 0 | 0 | 0 | 10 | 93.6 |
| Mon, Jun 15vsLAA | W 4-3 | H | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 8 | 81.8 |
| Fri, Jun 12@CIN | W 5-2 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 11 | 83.7 | |
| Wed, Jun 10@MIA | L 0-8 | 1.0 | 2 | 1 | 1 | 0 | 0 | 0 | 6 | 27.2 | |
| Sat, Jun 6vsWSH | L 1-6 | 1.0 | 0 | 0 | 0 | 1 | 1 | 0 | 17 | 50.2 | |
| Wed, Jun 3vsLAD | L 0-7 | 0.1 | 0 | 0 | 0 | 0 | 1 | 0 | 5 | – | |
| Tue, Jun 2vsLAD | L 5-6 | 1.0 | 3 | 2 | 2 | 2 | 1 | 0 | 23 | 7.0 | |
| Sun, May 31@SEA | L 2-3 | L | 0.1 | 1 | 1 | 0 | 1 | 0 | 0 | 4 | 25.8 |
| Fri, May 29@SEA | L 6-7 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 16 | 70.7 | |
| Mon, May 25@SF | W 6-2 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 14 | 40.6 | |
| Tue, May 19vsSF | W 5-3 | W | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 10 | 77.3 |
| Mon, May 18vsSF | W 12-2 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 17 | 55.8 | |
| Sat, May 16@COL | L 2-4 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 13 | 47.1 | |
| Fri, May 8vsNYM | L 1-3 | 0.2 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | – | |
| Tue, May 5vsPIT | W 9-0 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 15 | 81.8 | |
| Sat, May 2@CHC | L 0-2 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 3 | – | |
| Thu, Apr 30@MIL | L 1-13 | 0.2 | 1 | 1 | 1 | 1 | 1 | 0 | 17 | 23.6 | |
| Sun, Apr 26vsSD | W 12-7 | 1.0 | 1 | 0 | 0 | 0 | 0 | 0 | 16 | 57.1 | |
| Sat, Apr 25vsSD | L 4-6 | 1.0 | 0 | 0 | 0 | 0 | 1 | 0 | 18 | 81.8 | |
| Thu, Apr 23vsCHW | L 1-4 | 0.1 | 0 | 0 | 0 | 0 | 0 | 0 | 4 | – | |
| Tue, Apr 21vsCHW | L 5-11 | 1.1 | 1 | 0 | 0 | 1 | 2 | 0 | 27 | 52.1 | |
| Fri, Apr 17vsTOR | W 6-3 | H | 1.0 | 3 | 1 | 1 | 0 | 1 | 0 | 15 | 15.8 |
| Mon, Apr 13@BAL | L 7-9 | L | 0.2 | 1 | 2 | 2 | 1 | 0 | 1 | 19 | 6.6 |
| Sun, Apr 12@PHI | W 4-3 | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 9 | 85.4 | |
| Fri, Apr 10@PHI | W 5-4 | H | 1.0 | 0 | 0 | 0 | 0 | 3 | 0 | 15 | 85.0 |
| Tue, Apr 7@NYM | L 3-4 | B | 1.0 | 2 | 1 | 1 | 0 | 1 | 0 | 21 | 34.9 |
| Sun, Apr 5vsATL | W 6-5 | B | 1.0 | 3 | 1 | 1 | 0 | 1 | 0 | 25 | 21.1 |
| Sat, Apr 4vsATL | W 2-1 | H | 1.0 | 0 | 0 | 0 | 0 | 0 | 0 | 10 | 82.5 |
| Wed, Apr 1vsDET | W 1-0 | S | 1.0 | 2 | 0 | 0 | 0 | 0 | 0 | 16 | 19.3 |
| Sat, Mar 28@LAD | L 2-3 | H | 1.0 | 1 | 0 | 0 | 0 | 1 | 0 | 18 | 41.3 |
| Fri, Mar 27@LAD | L 4-5 | 1.1 | 0 | 0 | 0 | 0 | 1 | 0 | 14 | 92.2 |
2026 game log: hitting
Game grades need 3 plate appearances.
Scores, box scores and play-by-play from ESPN. The run values and park factors behind the grades were worked out from Retrosheet's play-by-play: the information used here was obtained free of charge from and is copyrighted by Retrosheet. Interested parties may contact Retrosheet at www.retrosheet.org.