Sergej van Aalst
Cincinnati (DSL) Rojos (R)
Sergej van Aalst
Birthdate:
May 22, 2004 (21 y, 2 m, 6 d)
Born In:
Hattem, GEL, NED
Nationality:
Dutch
Position:
P
Bats/Throws:
L/L
Height/Weight:
6'8"/209
Entry:
Unknown
Contract:
Minor League
ML Service Time:
None

2025 Season Pitching Summary

Team G GS IP W-L SV SD MD BB K ERA FIP FIP- xFIP WAR
Rojo - DSL
6 6 28.1 1-2 0 0 0 18 39 6.035 4.228 92 4.971 0.50
Current Status
MLB Service Time None
40-man Service Time None
Time as Pro 1 years
Roster Status Minor Leagues
Injury Status None
Personality
Leadership Low
Loyalty Normal
Desire for Win Very Low
Greed Normal
Intelligence Low
Work Ethic Very Low
Popularity
National Unknown
Local Fair
Current Contract
Minor League Contract
Batting Con Gap Pow Eye K's
Current 6 7 2 4 3
vs R 7 7 2 4 3
vs L 6 5 1 3 3
Potential 7 7 2 4 7
Fielding C IF OF
Range 1 1
Error 4 5
Arm 1 9 7
Turn DP 1
C Ability 1
Position
Pitcher 1
Run/Bunt
Speed 1
Stealing 3
Running 2
Sac Bunt 13
Bunt for Hit 1
Pitching Stuff Movement Control
Current 9 11 4
vs R 9 10 4
vs L 10 12 4
Potential 9 11 12
Pitch Ratings Cur Pot
Fastball 12 12
Curveball 7 8
Slider 11 11
Changeup 4 4
Other Pitching
Velocity 95-97 mph
GB % 52%
Stamina 13
Hold 18
OSA Rating History
Ratings Changes
2025-07-14
Movement increased from 10 to 11
Movement vs L increased from 11 to 12
2025-07-07
Power Potential increased from 1 to 2
Power increased from 1 to 2
Power vs R increased from 1 to 2
Hold increased from 17 to 18
2025-06-16
Control increased from 3 to 4
Control vs R increased from 3 to 4
2025-06-02
Curveball increased from 6 to 7
2025-05-05
Gap Potential increased from 6 to 7
Gap increased from 6 to 7
2025-04-21
Movement Potential increased from 10 to 11
Velocity increased from 94-96 mph to 95-97 mph
Fastball Pot increased from 11 to 12
Fastball increased from 11 to 12
2025-04-14
Stuff vs R increased from 8 to 9
Stuff vs L increased from 9 to 10
Velocity increased from 93-95 mph to 94-96 mph
Slider Pot increased from 10 to 11
Slider increased from 10 to 11
2025-03-09
Movement vs R increased from 9 to 10
GB% increased from 50% to 52%
2025-02-23
Outfield Arm decreased from 8 to 7
2025-02-08
Eye increased from 3 to 4
Eye vs R increased from 3 to 4
P defense decreased from 4 to 1
Stuff Potential increased from 8 to 9
Stuff increased from 8 to 9
Movement Potential decreased from 11 to 10
Movement decreased from 11 to 10
Movement vs R decreased from 11 to 9
Movement vs L decreased from 12 to 11
Velocity increased from 91-93 mph to 93-95 mph
Fastball Pot increased from 9 to 11
Fastball increased from 9 to 11
Curveball Pot increased from 7 to 8
Curveball increased from 5 to 6
Weight increased from 208 to 209
Local Popularity increased from Insignficant to Fair
2024-11-10
Gap vs R increased from 6 to 7
2024-09-23
Stuff vs R increased from 7 to 8
2024-09-16
Gap increased from 5 to 6
Gap vs L increased from 4 to 5
Eye vs L increased from 2 to 3
Control vs L increased from 3 to 4
2024-09-09
Contact vs R increased from 6 to 7
Stuff Potential increased from 7 to 8
Stuff increased from 7 to 8
Stuff vs L increased from 8 to 9
Velocity increased from 90-92 mph to 91-93 mph
Slider Pot increased from 9 to 10
Slider increased from 9 to 10
2024-07-15
Sac Bunt decreased from 14 to 13
Movement Potential decreased from 12 to 11
Movement decreased from 12 to 11
GB% decreased from 51% to 50%
2024-07-08
Sac Bunt increased from 13 to 14
Movement Potential increased from 11 to 12
Movement increased from 11 to 12
Movement vs L increased from 11 to 12
Velocity increased from 89-91 mph to 90-92 mph
Fastball Pot increased from 8 to 9
Fastball increased from 8 to 9
2024-06-24
Sac Bunt decreased from 14 to 13
Control Potential increased from 11 to 12
2024-06-17
Weight increased from 207 to 208
2024-06-10
Outfield Arm increased from 7 to 8
P defense increased from 3 to 4
Movement increased from 10 to 11
Movement vs R increased from 10 to 11
2024-05-20
Gap vs R increased from 5 to 6
2024-05-13
Stealing increased from 2 to 3
2024-04-07
Control Potential increased from 10 to 11
2024-03-29
Movement Potential increased from 10 to 11
2024-03-11
Weight increased from 206 to 207
2024-02-25
Outfield Error increased from 4 to 5
2023-12-19
Eye increased from 2 to 3
Eye vs R increased from 2 to 3
2023-11-09
Contact vs L increased from 5 to 6
P defense decreased from 4 to 3
Weight increased from 203 to 206
2023-09-11
Speed decreased from 2 to 1
Movement increased from 9 to 10
Movement vs R increased from 9 to 10
Movement vs L increased from 10 to 11
Control Potential increased from 9 to 10
Control increased from 2 to 3
Control vs R increased from 2 to 3
GB% decreased from 52% to 51%
2023-07-17
Eye vs L increased from 1 to 2
Speed increased from 1 to 2
Stealing decreased from 3 to 2
Movement vs L increased from 9 to 10
Control Potential increased from 8 to 9
Weight increased from 202 to 203
2023-05-29
Contact increased from 5 to 6
Contact vs L increased from 4 to 5
Avoid Ks increased from 2 to 3
Avoid Ks vs R increased from 2 to 3
Avoid Ks vs L increased from 2 to 3
Stealing increased from 2 to 3
P defense increased from 3 to 4
Movement vs L decreased from 10 to 9
Control Potential increased from 7 to 8
GB% decreased from 54% to 52%
Fastball Pot decreased from 9 to 8
Fastball decreased from 9 to 8
Curveball Pot increased from 6 to 7
Curveball increased from 4 to 5
Weight decreased from 204 to 202
2023-02-26
Contact vs R increased from 5 to 6
Gap increased from 4 to 5
Infield Error increased from 3 to 4
Infield Arm increased from 8 to 9
P defense decreased from 4 to 3
Stuff vs R increased from 6 to 7
Movement vs L increased from 9 to 10
Control vs L increased from 2 to 3
Velocity increased from 88-90 mph to 89-91 mph
Fastball Pot increased from 8 to 9
Fastball increased from 8 to 9
Curveball Pot increased from 5 to 6
Slider Pot increased from 8 to 9
Slider increased from 8 to 9
Changeup increased from 3 to 4
Weight increased from 202 to 204
2022-10-14
Gap vs R increased from 4 to 5
Gap vs L increased from 3 to 4
Eye increased from 1 to 2
Stuff vs R decreased from 7 to 6
Hold decreased from 18 to 17
Changeup Pot decreased from 5 to 4
2022-07-31
Movement Potential increased from 9 to 10
Control Potential increased from 6 to 7
Fastball Pot decreased from 9 to 8
Curveball Pot increased from 4 to 5
Slider Pot decreased from 9 to 8
Slider decreased from 9 to 8
Changeup Pot decreased from 6 to 5
2022-05-29
Contact increased from 2 to 5
Contact vs R increased from 2 to 5
Contact vs L increased from 1 to 4
Gap increased from 2 to 4
Gap vs R increased from 2 to 4
Gap vs L increased from 2 to 3
Eye vs R increased from 1 to 2
Avoid Ks increased from 1 to 2
Avoid Ks vs R increased from 1 to 2
Avoid Ks vs L increased from 1 to 2
Speed decreased from 3 to 1
Baserunning increased from 1 to 2
Outfield Range decreased from 2 to 1
Outfield Arm increased from 6 to 7
Stuff increased from 4 to 7
Stuff vs R increased from 4 to 7
Stuff vs L increased from 5 to 8
Movement Potential increased from 8 to 9
Movement increased from 8 to 9
Movement vs R increased from 8 to 9
Movement vs L increased from 8 to 9
Control Potential decreased from 7 to 6
Velocity increased from 84-86 mph to 88-90 mph
GB% decreased from 55% to 54%
Stamina decreased from 19 to 13
Hold increased from 17 to 18
Fastball Pot increased from 8 to 9
Fastball increased from 6 to 8
Curveball Pot increased from 2 to 4
Curveball increased from 2 to 4
Slider Pot decreased from 11 to 9
Slider increased from 7 to 9
Changeup Pot decreased from 11 to 6
Weight increased from 196 to 202
Height increased from 202 to 204
2021-04-10
Sac Bunt decreased from 15 to 14
Control Potential decreased from 8 to 7
Hold decreased from 18 to 17
Curveball Pot decreased from 3 to 2
Slider Pot decreased from 12 to 11
Weight decreased from 197 to 196

Career Minor League Stats

Team Year Age GS G IP W-L SV K BB K% BB% HR% LOB% GB% BABIP ERA FIP FIP- xFIP E-F WAR
Rojo - DSL
2025 21 6 6 28.1 1-2 0 39 18 29.10% 13.43% 0.75% 59.67% 39.53% 0.397 6.035 4.228 92 4.971 1.81 0.50
Rojo - DSL
2024 20 0 11 12.1 2-0 3 22 4 50.00% 9.09% 0.00% 77.78% 61.54% 0.133 1.460 2.422 52 3.024 -0.96 0.48
Total - R
R
6 17 40.2 3-2 3 61 22 34.27% 12.36% 0.56% 62.50% 44.64% 0.352 4.648 3.680 80 4.380 0.97 0.98

Career Minor League Fielding Stats

Team Year Pos G IP PO A E Fld % RF Eff ZR
Rojo - DSL
2025 P 6 28.1 0 1 0 1.000 0.318 0.534 -0.91
Total P 6 28.1 0 1 0 -0.91

Dominican Summer League Pitching Log

Date Opp Score GS IP H R ER HR BB K IBB HBP GB FB BF PI GSC WPA ERA FIP
July 24, 2025
Jul 24
Ori1 6 - 5 4.0 4 4 2 1 4 5 0 0 1 5 21 95 35 -0.30
July 18, 2025
Jul 18
@Yan1 3 - 4 6.0 4 1 1 0 2 9 0 0 5 3 23 93 70 0.17
July 13, 2025
Jul 13
@WS 2 - 10 2.1 5 7 7 0 3 3 0 1 2 2 16 75 20 -0.30
July 7, 2025
Jul 7
@Phil 4 - 2 5.0 5 1 1 0 4 8 0 0 3 4 24 94 57 0.18
July 2, 2025
Jul 2
Card 1 - 6 5.0 7 5 5 0 1 9 0 0 2 4 23 87 48 -0.31
June 27, 2025
Jun 27
@Dodg 5 - 4 6.0 5 3 3 0 4 5 0 1 4 8 27 90 54 -0.05
Player Awards
None