Seth Halvorsen

Seth Halvorsen

25-Year-Old PitcherRP
Colorado Rockies
2025 Fantasy Outlook
Halvorsen, a seventh-round draft pick by the Rockies in 2023, made his major-league debut last August after compiling a 4.47 ERA and 1.47 WHIP across 44.1 innings between Colorado's Double-A and Triple-A affiliates. The 6-foot-2 right-hander featured a four-pitch mix headlined by a 100 mph fastball that he tossed 37 percent of the time, but it was his splitter (28 percent usage) and slider (16 percent) that produced the most swing-and-miss. Halvorsen pitched well enough in his limited big-league sample (13:2 K:BB over 12.1 frames) to earn save chances over the final few weeks of the season, recording two in three opportunities. The 25-year-old's minor league track record suggest ratios and walks might be an issue, but Halvorsen's raw talent stands out among other relievers in Colorado's bullpen. He's worth gambling on as a closer-in-waiting type for 2025, but his save ceiling is capped due to the team he plays for. Read Past Outlooks
RANKS
Rest of Season
From Preseason
#397
ADP
Signed a one-year contract with the Rockies in August of 2024.
Earns eighth save
PColorado Rockies
July 6, 2025
Halvorsen walked a batter during a scoreless inning and earned a save against the White Sox on Sunday.
Analysis
Halvorsen worked around a two-out walk to close the 6-4 win. He's now converted eight of his 11 save chances this season and has five saves in his last eight appearances. Halvorsen dropped his season ERA to 4.04 with a 32:16 K:BB across 35.2 innings. He's given up two earned runs over his last 10 innings and has recorded the only two saves on the roster since July 1.
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Pitching Stats
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2025 MLB Game Log
2025
2024
2025 MLB Game Log
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Scoring
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2024 MLB Game Log
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Pitching Appearances Breakdown
Average Pitch Count
15
Last 10 Games
16
Last 5 Games
19
How many pitches does Seth Halvorsen generally throw?
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
 
1-10
 
11-20
 
21-30
 
31-40
 
41-50
 
51-60
 
61-70
 
71-80
 
81-90
 
91-100
 
101-110
 
111-120
 
121+
What part of the game does Seth Halvorsen generally pitch?
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
 
 
 
1st
 
 
 
2nd
 
 
 
3rd
 
 
 
4th
 
 
 
5th
 
 
 
6th
 
 
 
7th
 
 
 
8th
 
 
 
9th
 
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2023
 
 
-2%
BAA vs RHP
2025
 
 
-1%
BAA vs LHP
2024
 
 
-38%
BAA vs RHP
2023
No Stats
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .263 105 18 9 25 4 0 6
Since 2023vs Right .259 97 27 10 22 6 1 3
2025vs Left .284 75 10 7 19 4 0 5
2025vs Right .286 81 22 10 20 6 1 2
2024vs Left .214 30 8 2 6 0 0 1
2024vs Right .133 16 5 0 2 0 0 1
2023vs Left 0 0 0 0 0 0 0 0
2023vs Right 0 0 0 0 0 0 0 0
More Splits View More Split Stats
Home/Away Pitching Splits
Since 2023
 
 
-42%
ERA at Home
2025
 
 
-34%
ERA at Home
2024
 
 
-100%
ERA at Home
2023
No Stats
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2023Home 3.38 1.13 29.1 2 1 4 10.4 2.8 0.9
Since 2023Away 5.79 1.77 18.2 1 2 6 5.3 4.8 2.9
2025Home 4.43 1.34 22.1 1 1 3 10.5 3.6 1.2
2025Away 6.75 1.95 13.1 0 1 5 4.1 5.4 2.7
2024Home 0.00 0.43 7.0 1 0 1 10.3 0.0 0.0
2024Away 3.38 1.31 5.1 1 1 1 8.4 3.4 3.4
2023Home 0 0 0 0 0 0 0 0 0
2023Away 0 0 0 0 0 0 0 0 0
More Splits View More Split Stats
Stat Review
How does Seth Halvorsen compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.

* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
  • K/BB
    Strikeout to walk ratio.
  • K/9
    Average strikeouts per nine innings.
  • BB/9
    Average walks per nine innings.
  • HR/9
    Average home runs allowed per nine innings.
  • Fastball
    Average fastball velocity.
  • ERA
    Earned run average. The average earned runs allowed per nine innings.
  • WHIP
    Walks plus hits per inning pitched.
  • BABIP
    Batting average on balls in play. Measures how many balls in play against a pitcher go for hits.
  • GB/FB
    Groundball to flyball ratio. The higher the number, the more likely a pitcher is to induce groundballs.
  • Left On Base
    The percentage of base runners that a pitcher strands on base over the course of a season.
  • Exit Velocity
    The speed of the baseball as it comes off the bat, immediately after a batter makes contact.
  • Barrels/BBE
    The percentage of batted ball events resulting in a Barrel. A Barrel is a batted ball with similar exit velocity and launch angle to past ones that led to a minimum .500 batting average and 1.500 slugging percentage.
  • Spin Rate
    Spin Rate is the rate of spin on a baseball after it is released. It is measured in revolutions per minute (rpm).
  • Balls Hit 95+ MPH
    The percentage of batted balls hit that met or exceeded the 95 MPH threshold.
  • Swinging Strike
    The percentage of pitches that result in a swing and a miss.
K/BB
1.88
 
K/9
8.1
 
BB/9
4.3
 
HR/9
1.8
 
Fastball
100.2 mph
 
ERA
5.30
 
WHIP
1.57
 
BABIP
.318
 
GB/FB
1.96
 
Left On Base
67.1%
 
Exit Velocity
83.2 mph
 
Barrels/BBE
4.6%
 
Spin Rate
2116 rpm
 
Balls Hit 95+ MPH
25.0%
 
Swinging Strike
13.3%
 
Prospect Rankings History
Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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Recent RotoWire Articles Featuring Seth Halvorsen See More
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More Fantasy News
Records four-out save
PColorado Rockies
July 3, 2025
Halvorsen earned the save in Thursday's 7-6 win over the Astros, allowing one run on three hits while striking out one batter in 1.1 innings. He did not issue a walk.
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Scoreless ninth inning
PColorado Rockies
June 29, 2025
Halvorsen allowed two hits and one walk while striking out one across a scoreless ninth inning Sunday against the Brewers.
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Secures sixth save
PColorado Rockies
June 22, 2025
Halvorsen allowed a hit in a scoreless inning and earned a save over Arizona on Sunday. He struck out one batter.
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Can't convert save chance
PColorado Rockies
June 19, 2025
Halvorsen (1-2) blew the save and took the loss in Thursday's 4-3 extra-innings loss to Washington, allowing two runs (one earned) on one hit over two-thirds of an inning.
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Locks down fifth save
PColorado Rockies
June 18, 2025
Halvorsen picked up the save in Wednesday's 3-2 win over the Nationals, striking out two in a perfect ninth inning.
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Latest Fantasy Rumors
Target for Mets?
PColorado Rockies
June 24, 2025
Halvorsen is listed as a potential trade target for the Mets, according to Jim Bowden of The Athletic.
Analysis
The Mets need to find a way to bolster their bullpen before the July 31 trade deadline since they're likely to be in a tight race with Philadelphia and Atlanta for a playoff berth. On that note, Halvorsen is a player who could boost the team's bullpen dramatically. The right-hander owns a 4.31 ERA across 32 appearances this season.
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