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Diego
Sierra		  
Bats: Left
Throws: Right
Height: 6' 3''
Weight: 170
 
Born: December 14, 2000 in Dominican Republic
 
Ratings - Pitching     Help
                                                   
  Stuff Control Movement
Year Age Tm Lg Salary Endurance vL vR OA vL vR OA vL vR OA
2022 21 CA GE   7 3 4 4 6 7 7 4 5 5
2023 22 CA GE   7 4 4 4 6 7 7 5 6 5
2024 23 CA GE   7 4 4 4 6 7 7 6 7 6
2025 24 CA GE $ 300,000 7 4 4 4 6 7 7 7 8 8
2026 25 CA GE $ 300,000 7 5 5 5 6 7 7 7 8 8
2027 26 CA GE $ 300,000 7 5 6 6 6 7 7 8 9 9
2028 27 CA GE $ 300,000 7 6 7 7 6 7 7 8 9 9
2029 28 CA GE $ 6,980,000 7 7 7 7 6 7 7 9 10 9
OOTP6 Min Ratings   7 3 4 4 6 7 7 4 5 5
OOTP6 Max Ratings $ 6,980,000 7 7 7 7 6 7 7 9 10 9
Ratings - Batting     Help
                                             
  Contact Power Gap Eye Ks
Year Age Tm Lg Salary   vL vR OA vL vR OA vL vR OA vL vR OA vL vR OA
2022 21 CA GE     4 4 4 1 1 1 5 5 5 2 2 2 2 2 2
2023 22 CA GE     4 4 4 1 1 1 5 5 5 2 2 2 2 2 2
2024 23 CA GE     4 4 4 1 1 1 5 5 5 2 2 2 2 2 2
2025 24 CA GE $ 300,000   4 4 4 1 1 1 5 5 5 2 2 2 2 2 2
2026 25 CA GE $ 300,000   4 4 4 1 1 1 5 5 5 2 2 2 2 2 2
2027 26 CA GE $ 300,000   4 4 4 1 1 1 5 5 5 2 2 2 2 2 2
2028 27 CA GE $ 300,000   4 4 4 1 1 1 5 5 5 2 2 2 2 2 2
2029 28 CA GE $ 6,980,000   4 4 4 1 1 1 5 5 5 2 2 2 2 2 2
OOTP6 Min Ratings     4 4 4 1 1 1 5 5 5 2 2 2 2 2 2
OOTP6 Max Ratings $ 6,980,000   4 4 4 1 1 1 5 5 5 2 2 2 2 2 2
Pitching Stats     Help
Bold lines indicate player won James Yim Award or Bick Horizon Award.
Year Age Tm Lg W L Pct G GS CG SHO SV IP H ER HR BB SO ERA OAVG OOBP OSLG OOPS PWS
2022 21 AA   15 7 .682 29 29 1 1 0 194.0 192 71 10 41 99 3.29 .259 .298 .372 .670  
2023 22 AA   12 9 .571 29 29 2 2 0 184.0 193 85 15 44 68 4.16 .268 .310 .405 .715  
2024 23 AAA   5 5 .500 18 18 0 0 0 111.0 121 53 14 31 45 4.30 .278 .326 .441 .768  
    AA   4 6 .400 12 12 0 0 0 77.0 87 32 8 19 40 3.74 .279 .320 .429 .750  
2025 24 CA GE 4 6 .400 13 13 0 0 0 71.0 86 40 4 30 32 5.07 .296 .359 .443 .802 1.7
    AAA   5 3 .625 13 13 0 0 0 86.3 76 28 6 31 45 2.92 .235 .301 .349 .650  
2026 25 CA GE 8 6 .571 23 23 1 1 0 143.7 119 55 9 38 59 3.45 .225 .277 .347 .624 9.6
2027 26 CA GE 17 12 .586 34 34 2 1 0 224.0 189 78 22 55 108 3.13 .229 .277 .377 .654 17.9
2028 27 CA GE 12 10 .545 32 31 0 0 0 171.3 164 66 6 62 98 3.47 .249 .317 .360 .677 9.6
2029 28 CA GE 12 10 .545 35 35 2 1 0 234.7 209 69 7 72 144 2.65 .238 .296 .327 .623 20.4
5 Years Sim 53 44 .546 137 136 5 3 0 844.7 767 308 48 257 441 3.28 .241 .298 .361 .659 59.2
2 Years AAA 10 8 .556 31 31 0 0 0 197.3 197 81 20 62 90 3.69 .260 .315 .402 .717  
3 Years AA 31 22 .585 70 70 3 3 0 455.0 472 188 33 104 207 3.72 .266 .307 .395 .702  
5 Years Minors 41 30 .577 101 101 3 3 0 652.3 669 269 53 166 297 3.71 .264 .309 .397 .707  
Season Average 10 8 .556 27 27 1 0 0 168.9 153 61 9 51 88 3.28 .241 .298 .361 .659  
Career Highs 17 12 .586 35 35 2 1 0 234.7 209 78 22 72 144 5.07 .296 .359 .443 .802  
Career Pitching Splits     Help
Click on a Category to view yearly stats.
Category W L Pct G GS CG SHO SV IP H ER HR BB SO ERA OAVG OOBP OSLG OOPS
vs RH   444 185 29 143 279   .229 .282 .345 .627
vs LH   323 123 19 114 162   .259 .322 .386 .707
Home 24 23 .511 66 66 2 1 0 406.3 363 148 26 138 209 3.28 .238 .301 .359 .660
Away 29 21 .580 71 70 3 2 0 438.3 404 160 22 119 232 3.29 .244 .294 .362 .657
Mar/Apr 9 5 .643 18 18 1 1 0 116.7 91 40 9 36 58 3.09 .214 .275 .336 .611
May 10 4 .714 18 18 1 1 0 116.0 106 42 2 36 67 3.26 .244 .302 .348 .650
June 5 8 .385 20 19 0 0 0 100.3 114 43 9 38 54 3.86 .279 .340 .413 .753
July 9 7 .563 28 28 0 0 0 168.7 166 74 12 58 77 3.95 .258 .320 .389 .708
August 11 8 .579 24 24 2 0 0 167.7 127 39 7 38 85 2.09 .210 .257 .311 .568
Sep/Oct 9 12 .429 29 29 1 1 0 175.3 163 70 9 51 100 3.59 .244 .298 .371 .669
Batting Stats     Help
Bold lines indicate player won Tyson Bacon Award or Bick Horizon Award.
Year Age Tm Lg G AB R H 2B 3B HR RBI SB CS BB SO AVG OBP SLG OPS XR OWS
2024 23 AAA   2 1 1 0 0 0 0 0 1 0 0 0 .000 .000 .000 .000 0.1  
2025 24 CA GE 13 20 1 3 0 0 0 0 0 0 2 8 .150 .227 .150 .377 0.7 0.0
2026 25 CA GE 24 46 5 10 2 0 0 2 1 0 3 10 .217 .265 .261 .526 3.4 0.3
2027 26 CA GE 34 72 3 15 2 1 0 5 1 3 3 25 .208 .237 .264 .501 3.8 0.0
2028 27 CA GE 32 58 5 12 1 1 0 5 3 3 2 13 .207 .233 .259 .492 2.5 0.0
2029 28 CA GE 35 71 10 12 4 0 0 3 3 1 6 18 .169 .241 .225 .466 3.9 0.0
5 Years Sim 138 267 24 52 9 2 0 15 8 7 16 74 .195 .241 .243 .485 14.4 0.3
1 Years AAA 2 1 1 0 0 0 0 0 1 0 0 0 .000 .000 .000 .000 0.1  
162 Game Average 313 28 61 10 2 0 17 9 8 18 86 .195 .241 .243 .485 16.9  
Career Highs 35 72 10 15 4 1 0 5 3 3 6 25 .217 .265 .264 .526 3.9  
Career Batting Splits     Help
Click on a Category to view yearly stats.
Category G AB R H 2B 3B HR RBI SB CS BB SO AVG OBP SLG OPS XR
vs RH   185 16 35 7 1 0 9 6 5 12 56 .189 .241 .238 .479 8.7
vs LH   82 8 17 2 1 0 6 2 2 4 18 .207 .241 .256 .497 4.3
Home 66 117 12 29 6 2 0 8 3 3 8 28 .248 .296 .333 .629 10.8
Away 72 150 12 23 3 0 0 7 5 4 8 46 .153 .199 .173 .372 2.3
RISP   64 0 11 2 0 0 14 0 0 6 16 .172 .236 .203 .439 2.9
Close/Late   1 0 1 0 0 0 0 0 0 0 0 1.000 1.000 1.000 2.000 0.5
Mar/Apr 18 38 4 7 1 2 0 4 0 1 0 7 .184 .179 .316 .495 1.5
May 18 35 5 9 2 0 0 5 0 1 4 8 .257 .333 .314 .648 3.5
June 21 32 2 3 2 0 0 0 0 1 0 9 .094 .094 .156 .250 -1.2
July 28 54 4 7 0 0 0 3 2 0 4 20 .130 .190 .130 .319 0.7
August 24 56 4 14 4 0 0 3 4 3 2 12 .250 .283 .321 .605 4.3
Sep/Oct 29 52 5 12 0 0 0 0 2 1 6 18 .231 .310 .231 .541 4.2
Fielding Stats     Help
Bold lines indicate player won Zachary Matthews Award.
Year Age Tm Lg Pos G GS IP PO A E DP FPct RF    
2025 24 CA GE P 13 13 71.0 5 9 0 1 1.000 1.77    
2026 25 CA GE P 23 23 143.7 10 19 0 1 1.000 1.82    
2027 26 CA GE P 34 34 224.0 13 20 0 0 1.000 1.33    
2028 27 CA GE P 32 31 171.3 12 19 1 3 .969 1.63    
2029 28 CA GE P 35 35 234.7 9 28 2 2 .949 1.42    
Career Totals   137 136 844.7 49 95 3 7 .980 1.53    
Career Highs   35 35 234.7 13 28 2 3 1.000 1.82    
Pitching Leaderboards     Help
Top 10 finishes. Stats are Year-Rank-Value. League leaders are in bold.
Season Rankings are League Based.
ERA
2027-10-3.13
2029-4-2.65
 Innings Pitched
2029-9-234.7
 OSLG
2029-6-.327
 OOPS
2029-8-.623
    
 
   Black Ink Test: 0    (Avg Pitcher in HOF ~ 30)
   Gray Ink Test: 11    (Avg Pitcher in HOF ~ 143)
   Hall of Fame Standards: 22    (Avg Pitcher in HOF ~ 55)
 
Similar Pitchers     What are Similarity Scores?

  1. Jose Leanos (975)
  2. Jose Castillo (972)
  3. Manuel De La Cruz (968)
  4. Thomas Donnelly (967)
  5. Mats Johnston (961)
  6. Samuel Grijalva (958)
  7. Jeff Callahan (957)
  8. Gary Balsa (956)
  9. Nicholas Robey (955)
  10. Bacon Tuel (954)
History
Drafted in 1st round, 6th overall pick, by California in 2022
Injured on 4/28/2022 with a Tight Shoulder, out for one week
Injured on 7/11/2023 with a Strained Elbow Ligament, out for one week
Injured on 5/5/2025 with a Strained Bicep Muscle, out for 2-3 weeks
Earned first career win on 7/5/2025
Injured on 8/2/2025 with a Torn Tricep Muscle, out for 5 weeks
Had first career hit on 9/16/2025, off Salvatore Perez (CO)
Injured on 4/25/2026 with a Herniated Disc Back, out for 8-9 weeks
 
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