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.
Picks up third save
PColorado Rockies
June 4, 2025
Halvorsen didn't allow a baserunner and earned the save with a scoreless ninth inning Tuesday against the Marlins.
ANALYSIS
Zach Agnos (personal) had recorded two consecutive saves for the Rockies but is currently on the bereavement list. That set Halvorsen up for the save chance Tuesday, and he delivered his third save of the season. After a slow start to the year, Halvorsen has turned in five scoreless efforts in his last six appearances.
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Pitching Stats
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2025
2024
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2024 MLB Game Log
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Pitching Appearances Breakdown
Average Pitch Count
15
Last 10 Games
14
Last 5 Games
13
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
 
 
-3%
BAA vs LHP
2024
 
 
-38%
BAA vs RHP
2023
No Stats
BAA Batters K BB H 2B 3B HR
Since 2023vs Left .239 78 14 6 17 2 0 3
Since 2023vs Right .234 73 20 8 15 5 0 2
2025vs Left .256 48 6 4 11 2 0 2
2025vs Right .265 57 15 8 13 5 0 1
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
 
 
-9%
ERA at Home
2025
 
 
-23%
ERA on Road
2024
 
 
-100%
ERA at Home
2023
No Stats
ERA WHIP IP W L SV K/9 BB/9 HR/9
Since 2023Home 3.27 1.05 22.0 1 1 1 10.6 2.9 0.8
Since 2023Away 3.60 1.53 15.0 1 1 4 4.8 4.2 1.8
2025Home 4.80 1.33 15.0 0 1 0 10.8 4.2 1.2
2025Away 3.72 1.66 9.2 0 0 3 2.8 4.7 0.9
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
1.75
 
K/9
7.7
 
BB/9
4.4
 
HR/9
1.1
 
Fastball
100.1 mph
 
ERA
4.38
 
WHIP
1.46
 
BABIP
.302
 
GB/FB
2.47
 
Left On Base
66.0%
 
Exit Velocity
83.4 mph
 
Barrels/BBE
4.2%
 
Spin Rate
2047 rpm
 
Balls Hit 95+ MPH
26.3%
 
Swinging Strike
13.6%
 
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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More Fantasy News
Knocked around in defeat
PColorado Rockies
May 19, 2025
Halvorsen (0-1) took the loss and was charged with a blown save Monday against the Phillies, allowing four runs on five hits while striking out one batter over two-thirds of an inning.
ANALYSIS
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Notches save Saturday
PColorado Rockies
May 17, 2025
Halvorsen picked up a save against Arizona on Saturday, walking one batter in a scoreless and hitless inning of work.
ANALYSIS
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Used as setup man Wednesday
PColorado Rockies
April 30, 2025
Halvorsen struck out two in a perfect eighth inning Wednesday to record his first hold of the season in a 2-1 win over Atlanta.
ANALYSIS
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Gets high-leverage work
PColorado Rockies
April 20, 2025
Halvorsen allowed one hit and struck out two across 1.1 scoreless innings in the first game of Sunday's doubleheader against the Nationals.
ANALYSIS
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Bounces back to close out win
PColorado Rockies
April 10, 2025
Halvorsen walked one and struck out one across a scoreless ninth inning Thursday against the Brewers.
ANALYSIS
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Latest Fantasy Rumors
Potential trade candidate
PColorado Rockies
June 3, 2025
Halvorsen is one of the players the Rockies might trade before the deadline, according to Mark Feinsand of MLB.com.
ANALYSIS
Halvorsen's numbers this season aren't eye-popping by any means, as he owns a 4.56 ERA and a 1.52 WHIP across 23.2 innings and 24 appearances in 2025. However, it wouldn't be odd if some contenders show interest in the former Missouri standout. He owns a triple-digit fastball, and his 58.2 percent groundball rate is among the highest in all of baseball.
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