2025 Stats
W-L
1-2
ERA
4.45
WHIP
1.42
K
28
SV
5
Rest-of-Season Projections
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
Can't convert save chance
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.
ANALYSIS
Halvorsen broke a streak of four consecutive scoreless appearances, surrendering a walk-off, two-run homer to James Wood in the bottom of the 11th frame. The outing marked his third blown save of the campaign. In 30.1 innings this season, Halvorsen has a 4.45 ERA and 28:14 K:BB with five saves.
Halvorsen broke a streak of four consecutive scoreless appearances, surrendering a walk-off, two-run homer to James Wood in the bottom of the 11th frame. The outing marked his third blown save of the campaign. In 30.1 innings this season, Halvorsen has a 4.45 ERA and 28:14 K:BB with five saves.
Pitching Stats
Loading Pitching Stats...
2025
2024
Minor League Game Log
Calculate Stats Over Time
Just click on any two dates.
Loading Minor League Pitching Game Log...
Pitching Appearances Breakdown
Average Pitch Count
15
Last 10 Games
13
Last 5 Games
12
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+
What part of the game does Seth Halvorsen generally pitch?
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
-3%
BAA vs RHP
2025
-2%
BAA vs LHP
| BAA | K | BB | H | HR | ||||
|---|---|---|---|---|---|---|---|---|
| Since 2023vs Left | .244 | 17 | 8 | 20 | 5 | |||
| Since 2023vs Right | .236 | 24 | 8 | 17 | 2 | |||
| 2025vs Left | .259 | 9 | 6 | 14 | 4 | |||
| 2025vs Right | .263 | 19 | 8 | 15 | 1 | |||
| 2024vs Left | .214 | 8 | 2 | 6 | 1 | |||
| 2024vs Right | .133 | 5 | 0 | 2 | 1 | |||
| 2023vs Left | 0 | 0 | 0 | 0 | 0 | |||
| 2023vs Right | 0 | 0 | 0 | 0 | 0 | |||
| More Splits→ | View More Split Stats | |||||||
Home/Away Pitching Splits
Since 2023
-1%
ERA on Road
2025
-27%
ERA on Road
| ERA | WHIP | IP | K/9 | BB/9 | |||||
|---|---|---|---|---|---|---|---|---|---|
| Since 2023Home | 3.60 | 1.12 | 25.0 | 11.2 | 2.9 | ||||
| Since 2023Away | 3.57 | 1.42 | 17.2 | 5.1 | 4.1 | ||||
| 2025Home | 5.00 | 1.39 | 18.0 | 11.5 | 4.0 | ||||
| 2025Away | 3.65 | 1.46 | 12.1 | 3.6 | 4.4 | ||||
| 2024Home | 0.00 | 0.43 | 7.0 | 10.3 | 0.0 | ||||
| 2024Away | 3.38 | 1.31 | 5.1 | 8.4 | 3.4 | ||||
| 2023Home | 0 | 0 | 0 | 0 | 0 | ||||
| 2023Away | 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.
* 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
2.00K/9
8.3BB/9
4.2HR/9
1.5Fastball
100.1 mphERA
4.45WHIP
1.42BABIP
.294GB/FB
2.45Left On Base
66.7%Exit Velocity
83.3 mphBarrels/BBE
4.6%Spin Rate
2104 rpmBalls Hit 95+ MPH
25.4%Swinging Strike
13.1%Prospect Rankings History
Advanced Pitching Stats
Loading Advanced Pitching Stats...
Defensive Stats
Loading MLB Defensive Stats...
Stats Vs Today's Lineup
Want more matchup stats?
Loading Matchup Stats...
Our full team depth charts are reserved for RotoWire subscribers.
Subscribe Now
Recent RotoWire Articles Featuring Seth Halvorsen See More
Explore the evolving roles in National League bullpens and discover key players set to impact your fantasy baseball lineup. Stay ahead with strategic insights!
Which closers have most improved their ranking so far this season, and which have tumbled down the list?
No shortage of players -- including White Sox outfielder Luis Robert Jr. -- are being dropped by fantasy baseball experts in the RotoWire Online Championship.
A number of available pitchers are discussed in Jan Levine's latest NL review.
James Anderson provides the top relief pitching prospects for your dynasty leagues on all 30 teams, plus the top reliever prospects to add in dynasty leagues, led by Rays lefty Mason Montgomery!
More Fantasy News
Locks down fifth save
Halvorsen picked up the save in Wednesday's 3-2 win over the Nationals, striking out two in a perfect ninth inning.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Works fifth save
Halvorsen picked up the save, walking one batter in the process, during Monday's 6-4 win over the Nationals.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Picks up third save
Halvorsen didn't allow a baserunner and earned the save with a scoreless ninth inning Tuesday against the Marlins.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Knocked around in defeat
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
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Notches save Saturday
Halvorsen picked up a save against Arizona on Saturday, walking one batter in a scoreless and hitless inning of work.
ANALYSIS
Subscribe now to instantly reveal our take on this news.
Subscribe now to instantly reveal our take on this news.
Latest Fantasy Rumors
Mets could pursue
Halvorsen could be a target for the Mets ahead of the trade deadline, Jim Bowden of The Athletic speculates.
ANALYSIS
The Mets are expected to bolster their bullpen ahead of the deadline and could use at least one more reliable arm, so it makes sense for them to target someone like Halvorsen. The right-hander has gone 3-for-5 in save opportunities this season, and he owns a 4.55 ERA with a 1.48 WHIP across 28 outings.
The Mets are expected to bolster their bullpen ahead of the deadline and could use at least one more reliable arm, so it makes sense for them to target someone like Halvorsen. The right-hander has gone 3-for-5 in save opportunities this season, and he owns a 4.55 ERA with a 1.48 WHIP across 28 outings.