| 07/14/2024 |
Drafted by the Tampa Bay Rays in the 1st round (18th) of the 2024 MLB June Amateur Draft from Westlake HS (Austin, TX). |
| 07/26/2024 |
Tampa Bay Rays signed OF Theo Gillen. |
| 03/14/2025 |
Named the #99 prospect in the MLB |
| 04/04/2025 |
Charleston RiverDogs placed OF Theo Gillen on the 7-day injured list. [Auto] |
| 04/27/2025 |
Charleston RiverDogs activated OF Theo Gillen from the 7-day injured list. [Auto] |
| 10/02/2025 |
Wins the 2025 CAR Platinum Stick Award at CF. |
| 10/05/2025 |
Wins the 2025 South Atlantic League Round 2 with the Bowling Green Hot Rods! |
| 11/02/2025 |
Named the #31 prospect in the MLB |
| 01/01/2026 |
OSA scouting updated ratings (potential): Contact: 40 (60); Power: 35 (50); Eye: 40 (55). |
| 03/24/2026 |
Named the #25 prospect in the MLB |
| 04/10/2026 |
Injured (hamstring soreness),day-to-day for 2 days. |
| 06/07/2026 |
Injured on 06/06/2026, diagnosed with a mild calf strain, is day-to-day. |
| 06/29/2026 |
Named the #21 prospect in the MLB |
| 07/05/2026 |
Was selected to the 2026 Southern League All-Star Game. |
| 07/19/2026 |
Was selected to the 2026 Major League Baseball All-Star Futures Game. |
| 08/24/2026 |
Wins the IL Player of the Week Award. |
| 09/01/2026 |
Wins the IL Batter of the Month Award. |
| 09/11/2026 |
Injured (bruised knee),day-to-day for 5 days. |
| 11/05/2026 |
Named the #19 prospect in the MLB |
| 01/01/2027 |
OSA scouting updated ratings (potential): Contact: 45 (60); Power: 40 (50); Eye: 45 (55). |
| 02/17/2027 |
Outstandingly completed training to improve his plate discipline at the Tampa Bay Rays development complex. |
| 03/23/2027 |
Named the #23 prospect in the MLB |
| 05/27/2027 |
Injured on 05/25/2027, diagnosed with a partially torn ulnar collateral ligament, will miss 4 months. |
| 06/28/2027 |
Named the #9 prospect in the MLB |
| 11/07/2027 |
Named the #14 prospect in the MLB |
| 11/30/2027 |
Received a 1-year contract through automatic renewal worth a total of $740,000. |
| 01/01/2028 |
OSA scouting updated ratings (potential): Contact: 50 (60); Power: 45 (50); Eye: 50 (60). |
| 02/16/2028 |
Unsuccessfully completed training to improve his strength and conditioning at the Tampa Bay Rays development complex. |
| 03/21/2028 |
Named the #14 prospect in the MLB |
| 04/03/2028 |
Injured (strained hamstring),day-to-day for 4 weeks. |
| 05/01/2028 |
Wins the MLB AL Rookie of the Month Award. |
| 06/01/2028 |
Wins the MLB AL Rookie of the Month Award. |
| 06/16/2028 |
Injured (knee inflammation),day-to-day for 2 weeks. |
| 07/01/2028 |
Wins the MLB AL Rookie of the Month Award. |
| 10/01/2028 |
Wins the MLB AL Rookie of the Month Award. |
| 11/14/2028 |
Finished 3rd in 2028 MLB AL Rookie of the Year Award voting. |
| 11/26/2028 |
Received a 1-year contract through automatic renewal worth a total of $740,000. |
| 01/01/2029 |
OSA scouting updated ratings (potential): Contact: 55 (65); Power: 45 (50); Eye: 55 (60). |
| 03/11/2029 |
Injured (elbow contusion),day-to-day for one week. |
| 04/22/2029 |
Injured on 04/20/2029, diagnosed with chronic back soreness, will miss 4-5 weeks. |
| 10/03/2029 |
Injured on 09/30/2029, diagnosed with a torn groin muscle, will miss 6 weeks. |
| 11/24/2029 |
Received a 1-year contract through automatic renewal worth a total of $740,000. |
| 01/01/2030 |
OSA scouting updated ratings (potential): Contact: 55 (65); Power: 45 (50); Eye: 55 (60). |
| 03/19/2030 |
Outstandingly completed training to learn a new position at the Tampa Bay Rays development complex. |
| 03/31/2030 |
Goes 5-7 against the Arizona Diamondbacks, with 1 2B, 1 RBI and 2 R. |
| 11/06/2030 |
Signed a 1-year contract extension worth a total of $4,440,000 with the Tampa Bay Rays organization. |
| 01/01/2031 |
OSA scouting updated ratings (potential): Contact: 55 (65); Power: 45 (50); Eye: 55 (55). |
| 05/16/2031 |
Injured on 05/13/2031, diagnosed with a torn groin muscle, will miss 7 weeks. |
| 07/25/2031 |
Injured (sore ankle),day-to-day for 5 days. |
| 09/23/2031 |
Injured (herniated disc (back)),out for 2 weeks. |
| 10/28/2031 |
Wins the 2031 World Series with the Tampa Bay Rays. |
| 11/02/2031 |
Signed a 4-year contract extension worth a total of $57,700,000 with the Tampa Bay Rays organization. |
| 01/01/2032 |
OSA scouting updated ratings (potential): Contact: 55 (60); Power: 50 (50); Eye: 55 (60). |
| 02/18/2032 |
Successfully completed training to improve his strength and conditioning at the Tampa Bay Rays development complex. |
| 01/01/2033 |
OSA scouting updated ratings (potential): Contact: 50 (55); Power: 45 (45); Eye: 55 (55). |
| 06/07/2033 |
Injured on 06/03/2033, diagnosed with a herniated disc, will miss 6 weeks. |
| 10/20/2033 |
Decided not to opt out of the remaining portion of his contract. |
| 01/01/2034 |
OSA scouting updated ratings (potential): Contact: 50 (55); Power: 45 (45); Eye: 55 (55). |
| 03/23/2034 |
Injured (food poisoning),out for 3 days. |
| 05/29/2034 |
Injured (back tightness),day-to-day for 2 days. |
| 06/24/2034 |
Injured on 06/23/2034, diagnosed with knee inflammation, is day-to-day. |
| 06/26/2034 |
Injured (knee inflammation),day-to-day for 1-2 weeks. |
| 07/04/2034 |
Injured (herniated disc (back)),out for 3 weeks. |
| 07/05/2034 |
Was selected to the 2034 Major League Baseball All-Star Game. |
| 08/15/2034 |
Injured on 08/13/2034, diagnosed with chronic back soreness, will miss 3 weeks. |
| 01/01/2035 |
OSA scouting updated ratings (potential): Contact: 50 (50); Power: 45 (45); Eye: 60 (60). |
| 02/18/2035 |
Injured on 02/17/2035, diagnosed with knee inflammation, is day-to-day. |
| 08/25/2035 |
Injured on 08/22/2035, diagnosed with a herniated disc, will miss 3-4 months. |
| 11/07/2035 |
Became a free agent. |
| 11/25/2035 |
Signed a 2-year contract worth a total of $30,000,000 with the New York Yankees organization. |
| 01/01/2036 |
OSA scouting updated ratings (potential): Contact: 50 (50); Power: 45 (45); Eye: 60 (60). |
| 04/20/2036 |
Injured (knee inflammation),day-to-day for 2 weeks. |
| 04/23/2036 |
Injured (knee inflammation),day-to-day for one week. |
| 05/18/2036 |
Injured on 05/17/2036, diagnosed with knee tendinitis, is day-to-day. |
| 07/02/2036 |
Injured (herniated disc (back)),out for one week. |
| 07/07/2036 |
Injured (herniated disc (back)),day-to-day for 3 days. |