Age: 27, 238 lbs, 6'0" Born: 7/20/1998, Valencia, Venezuela Sal: N/A  Currently Injured TRANSACTION REPORT 4 monthsBack on concussion IL. The Nationals placed Ruiz on the 7-day concussion injured list.
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| 2025 | WSH | 68 | 255 | 26 | 19 | 63 | 12 | 0 | 2 | 81 | 25 | 0 | 2 | 8 | 0 | 4 | 3 | 0 | 1 | 3 | 0.247 | 0.277 | 0.318 | 0.595 | 81.0 | 1.2 |
| 2024 | WSH | 127 | 459 | 54 | 46 | 105 | 21 | 0 | 13 | 165 | 57 | 3 | 1 | 16 | 0 | 13 | 5 | 0 | 5 | 2 | 0.229 | 0.260 | 0.359 | 0.619 | 165.0 | 1.3 |
| 2023 | WSH | 136 | 523 | 58 | 55 | 136 | 24 | 0 | 18 | 214 | 67 | 1 | 1 | 31 | 1 | 13 | 6 | 0 | 2 | 8 | 0.260 | 0.308 | 0.409 | 0.717 | 214.0 | 1.6 |
| 2022 | WSH | 112 | 394 | 50 | 33 | 99 | 22 | 0 | 7 | 142 | 36 | 6 | 1 | 30 | 0 | 9 | 6 | 1 | 2 | 7 | 0.251 | 0.313 | 0.360 | 0.673 | 142.0 | 1.3 |
| 2021 | WSH | 29 | 88 | 9 | 10 | 24 | 3 | 0 | 3 | 36 | 15 | 0 | 0 | 6 | 0 | 3 | 2 | 0 | 0 | 1 | 0.273 | 0.333 | 0.409 | 0.742 | 36.0 | 1.2 |
| 2020 | LAD | 2 | 8 | 3 | 1 | 2 | 0 | 0 | 1 | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.250 | 0.250 | 0.625 | 0.875 | 5.0 | 2.5 |
| | | 474 | 1727 | 200 | 164 | 429 | 82 | 0 | 44 | 643 | 201 | 10 | 5 | 91 | 1 | 42 | 22 | 1 | 10 | 21 | 0.252 | 0.290 | 0.413 | 0.704 | 643.0 | 1.5 |
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| 7/5/2025 | BOS | L3 - 10 | 4 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.250 | 0.250 | 1.000 | 1.250 | 1.0 |
| 7/4/2025 | BOS | L2 - 11 | 4 | 2 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.250 | 0.250 | 1.000 | 1.250 | 1.0 |
| 6/23/2025 | SD@ | W10 - 6 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | 0.0 |
| 6/22/2025 | LAD@ | L7 - 13 | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | 0.0 |
| 6/21/2025 | LAD@ | W7 - 3 | 3 | 0 | 1 | 3 | 2 | 0 | 0 | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 1.000 | 0.750 | 5.000 | 5.750 | 5.0 |
| 6/19/2025 | COL | W4 - 3 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | 0.0 |
| 6/18/2025 | COL | L1 - 3 | 4 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | 0.0 |
| 6/17/2025 | COL | L6 - 10 | 4 | 1 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.250 | 0.250 | 1.000 | 1.250 | 1.0 |
| 6/15/2025 | MIA | L1 - 3 | 4 | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.250 | 0.250 | 1.000 | 1.250 | 1.0 |
| 6/14/2025 | MIA | L3 - 4 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0.000 | 0.000 | 0.000 | 0.000 | 0.0 |
| | | | 34 | 3 | 1 | 7 | 2 | 0 | 0 | 9 | 2 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0.200 | 0.175 | 0.900 | 1.075 | 9.0 |
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| K. Ruiz | C | WSH | 9/15/2025 | Continuing to prepare for return | concussion | + |
| K. Ruiz | C | WSH | 9/8/2025 | Still having concussion symptoms | concussion | + |
| K. Ruiz | C | WSH | 9/5/2025 | Won't return this weekend | concussion | + |
| K. Ruiz | C | WSH | 9/2/2025 | Starting rehab stint | concussion | + |
| K. Ruiz | C | WSH | 8/29/2025 | Rehab assignment coming soon | concussion | + |
| K. Ruiz | C | WSH | 8/27/2025 | Takes part in BP | concussion | + |
| K. Ruiz | C | WSH | 8/12/2025 | Working out, but still in protocol | concussion | + |
| K. Ruiz | C | WSH | 7/18/2025 | Slowly resuming baseball activities | concussion | + |
| K. Ruiz | C | WSH | 6/24/2025 | Sent to hospital for evaluation | head | + |
| K. Ruiz | C | WSH | 6/23/2025 | Exits with head injury | head | + |
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| K. Ruiz | C | WSH | 7/8/2025 | Back on concussion IL. |
| K. Ruiz | C | WSH | 7/4/2025 | Back from injured list. |
| K. Ruiz | C | WSH | 6/27/2025 | Moved to 7-day IL. |
| K. Ruiz | C | WSH | 6/24/2025 | Lands on injured list. |
| K. Ruiz | C | WSH | 4/15/2024 | Lands on 10-day IL. |
| K. Ruiz | C | WSH | 3/10/2023 | Gets long-term extension. |
| K. Ruiz | C | WSH | 9/9/2022 | Lands on injured list. |
| K. Ruiz | C | WSH | 8/30/2021 | Call-up official. |
| K. Ruiz | C | WSH | 7/29/2021 | Moved to Nationals. |
| K. Ruiz | C | WSH | 5/17/2021 | Sent down. |
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| K. Ruiz | C | WSH | 5/19/2024 | 5/27/2024 | -1 | Stealers allowed |
| K. Ruiz | C | WSH | 6/6/2023 | 6/8/2023 | +1 | Stealers allowed |
| K. Ruiz | C | WSH | 4/7/2023 | 5/18/2023 | -1 | Hits |
| K. Ruiz | C | WSH | 4/7/2023 | 5/18/2023 | -1 | RBIs |
Stars of the month
| | | | |
| March 27, 2025 | K. Ruiz | WSH | C | NA |
| March 31, 2025 | K. Ruiz | WSH | C | NA |
| April 04, 2025 | K. Ruiz | WSH | C | NA |
| April 06, 2025 | K. Ruiz | WSH | C | 3rd star |
| April 09, 2025 | K. Ruiz | WSH | C | 3rd star |
| April 11, 2025 | K. Ruiz | WSH | C | 3rd star |
| April 12, 2025 | K. Ruiz | WSH | C | NA |
| April 13, 2025 | K. Ruiz | WSH | C | NA |
| April 14, 2025 | K. Ruiz | WSH | C | NA |
| April 19, 2025 | K. Ruiz | WSH | C | 3rd star |
| April 23, 2025 | K. Ruiz | WSH | C | 3rd star |
| April 24, 2025 | K. Ruiz | WSH | C | NA |
| April 26, 2025 | K. Ruiz | WSH | C | Rookie star |
| April 29, 2025 | K. Ruiz | WSH | C | 3rd star |
| April 30, 2025 | K. Ruiz | WSH | C | NA |
| May 02, 2025 | K. Ruiz | WSH | C | 3rd star |
| May 04, 2025 | K. Ruiz | WSH | C | 3rd star |
| May 06, 2025 | K. Ruiz | WSH | C | NA |
| May 07, 2025 | K. Ruiz | WSH | C | NA |
| May 10, 2025 | K. Ruiz | WSH | C | 3rd star |
| May 12, 2025 | K. Ruiz | WSH | C | 3rd star |
| May 13, 2025 | K. Ruiz | WSH | C | NA |
| May 14, 2025 | K. Ruiz | WSH | C | 3rd star |
| May 15, 2025 | K. Ruiz | WSH | C | 3rd star |
| May 16, 2025 | K. Ruiz | WSH | C | NA |
| May 22, 2025 | K. Ruiz | WSH | C | 3rd star |
| May 23, 2025 | K. Ruiz | WSH | C | Rookie star |
| May 28, 2025 | K. Ruiz | WSH | C | Rookie star |
| May 29, 2025 | K. Ruiz | WSH | C | NA |
| June 03, 2025 | K. Ruiz | WSH | C | NA |
| June 05, 2025 | K. Ruiz | WSH | C | NA |
| June 07, 2025 | K. Ruiz | WSH | C | 3rd star |
| June 10, 2025 | K. Ruiz | WSH | C | 3rd star |
| June 12, 2025 | K. Ruiz | WSH | C | NA |
| June 13, 2025 | K. Ruiz | WSH | C | Rookie star |
| June 15, 2025 | K. Ruiz | WSH | C | 3rd star |
| June 17, 2025 | K. Ruiz | WSH | C | NA |
| June 19, 2025 | K. Ruiz | WSH | C | Rookie star |
| July 04, 2025 | K. Ruiz | WSH | C | NA |
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Stars of the week
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| March 27, 2025 | K. Ruiz | WSH | C | NA |
| March 29, 2025 | K. Ruiz | WSH | C | 2nd star |
| March 30, 2025 | K. Ruiz | WSH | C | 2nd star |
| March 31, 2025 | K. Ruiz | WSH | C | NA |
| April 01, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 02, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 04, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 06, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 07, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 08, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 09, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 11, 2025 | K. Ruiz | WSH | C | NA |
| April 12, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 13, 2025 | K. Ruiz | WSH | C | NA |
| April 14, 2025 | K. Ruiz | WSH | C | NA |
| April 15, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 16, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 19, 2025 | K. Ruiz | WSH | C | NA |
| April 20, 2025 | K. Ruiz | WSH | C | NA |
| April 22, 2025 | K. Ruiz | WSH | C | NA |
| April 23, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 24, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 25, 2025 | K. Ruiz | WSH | C | NA |
| April 26, 2025 | K. Ruiz | WSH | C | NA |
| April 28, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 29, 2025 | K. Ruiz | WSH | C | 2nd star |
| April 30, 2025 | K. Ruiz | WSH | C | 2nd star |
| May 01, 2025 | K. Ruiz | WSH | C | 2nd star |
| May 02, 2025 | K. Ruiz | WSH | C | 2nd star |
| May 04, 2025 | K. Ruiz | WSH | C | NA |
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