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Stephen Kolek or Foster Griffin

Who Should I Start? - Week 15 • Start New
Stephen Kolek

Stephen Kolek

SPKansas City Royals KC
Foster Griffin

Foster Griffin

SPWashington Nationals WAS
OR
🔓 EXPERT ANALYSIS

Owners starting Kolek over Griffin

 
 
 
 
START BOTH START BENCH BOTH BN

Includes Detailed Projections

Outlook Stephen Kolek

Stephen Kolek's Stellar Run Makes Him a Reliable Option for the Injured Royals

Stephen Kolek is on an absolute tear, posting a microscopic 0.74 ERA and 1.24 WHIP over his last 14 days, including a spectacular shutout win on June 14. This hot streak is a massive boost for the fifth-place Royals, who currently sit at 30-45 in the AL Central and have seen their rotation decimated by injuries to Seth Lugo and Cole Ragans. With those arms sidelined, Kolek has confidently secured his place as the number four starter in the rotation.

While Kolek's outstanding 1.90 ERA over the last 30 days is eye-catching, some regression is expected back toward his career baseline, as our season projection forecasts a 4.28 ERA and 1.36 WHIP. However, his strong 2026 campaign with a 2.73 ERA and 1.05 WHIP through 49.4 innings is supported by vastly improved command, evidenced by just 10 walks on the year. This suggests his step forward is legitimate rather than a fluke.

Looking at the week ahead, Kolek is scheduled for a single home start on June 21 against the Cardinals and their starter Dustin May, who carries a 3.75 ERA and a 1.14 WHIP. Given his current momentum and excellent command, Kolek is a highly viable option to deploy in all standard formats. Verdict: Start.

Updated 2 days ago

Latest News Stephen Kolek
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🔓 EXPERT ANALYSIS

Owners starting Griffin over Kolek

 
 
 
 
START BOTH START BENCH BOTH BN

Includes Detailed Projections

Outlook Foster Griffin

Foster Griffin continues his strong run in the Nationals rotation, but with no remaining starts this week, fantasy managers should look ahead.

Foster Griffin has been exceptional recently, posting a stellar 1.59 ERA and 0.94 WHIP with 15 strikeouts over his last three starts. He is locked in as a key member of the starting rotation for the 39-36 Nationals, especially with rotation depth tested by injuries to Josiah Gray and Jake Irvin.

While our season projection is more conservative with a 4.17 ERA and 1.28 WHIP, Griffin’s actual 3.35 ERA and 1.12 WHIP over 15 starts look highly sustainable. His revamped splitter has fueled an impressive 80 strikeouts in 83.3 innings, proving his transition back from Japan is a major success.

Griffin already delivered a quality start earlier this week on June 16, holding Kansas City to one run over six frames on exactly 100 pitches. With Washington heading to Tampa Bay for the weekend and no remaining starts scheduled for Griffin, he can be safely benched in weekly matchups. Verdict: Sit.

Updated 2 days ago

Latest News Foster Griffin
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Performance Stephen Kolek
Fantasy Chart Loading...

ERA W-L HLD SV SO WLK WHIP GP
0.001-000410.851
Season stats based on the past 7 days

ERA W-L HLD SV SO WLK WHIP GP
0.741-000721.242
Season stats based on the past 14 days
Performance Foster Griffin
Fantasy Chart Loading...

ERA W-L HLD SV SO WLK WHIP GP
1.500-000621.331
Season stats based on the past 7 days

ERA W-L HLD SV SO WLK WHIP GP
1.500-0001121.172
Season stats based on the past 14 days
Next Up Own/Start Comparison
OWN/START Stephen Kolek
OWN
59%
+11.8 compared to last week
START
19%
-15.11 compared to last week
OWN/START Foster Griffin
OWN
77%
+9.38 compared to last week
START
47%
+12.03 compared to last week
Next Up Consensus Rankings
Expert Consensus Stephen Kolek
108th
Average Ranking of Fantasy Experts
Expert Consensus Foster Griffin
68th
Average Ranking of Fantasy Experts
Next Up Player Breakdowns
Breakdown Stephen Kolek

    Overview

  • Experts rank this player at 108th among SP's. Based on his stats from the past 60 days, he is currently ranked 47th.
  • The current leader among SP's is Jacob Misiorowski
  • He is performing amazing in the past 30 days. If he can keep it up, then keep him. . otherwise think trade.
  • Trending Pitching Stats

  • Top 25 in WHIP and is currently ranked 24th with 1.05
  • Top 35 in ERA and is currently ranked 26th with 2.73
  • Top 50 in wins and is currently ranked 47th with 4
  • At this point in the season his numbers compared to last years: W: +1, L: -1, WHIP: -0.299, ERA: -1.03, K's: -3, Walks: -9
Breakdown Foster Griffin

    Overview

  • Experts rank this player at 69th among SP's. Based on his stats from the past 60 days, he is currently ranked 12th.
  • The current leader among SP's is Jacob Misiorowski
  • He is performing amazing in the past 30 days. Will he keep it up?
  • Trending Pitching Stats

  • Top 35 in WHIP and is currently ranked 29th with 1.06
  • Top 50 in ERA and is currently ranked 46th with 3.42
  • Top 75 in walks and is currently ranked 75th with 16
  • Top 75 in strikeouts and is currently ranked 61st with 61
  • Top 25 in wins and is currently ranked 22nd with 5
  • Top 50 in innings pitched and is currently ranked 40th with 63.1
  • His average points in the past two weeks have remained fairly consistant and rose slightly by 0.8 PPG.
  • At this point in the season his numbers compared to last years: W: +7, L: +2, WHIP: +1.11, ERA: +3.32, K's: +80, Walks: +23
Next Up Health Check
Injury Stephen Kolek

No Injury Reported

Injury Foster Griffin

No Injury Reported

Next Up Matchup Comparison
Matchups Stephen Kolek
DateOpponentResult
Jun 15@WASBrad LordL 7-3
Jun 16@WASPaxton SchultzL 6-4
Jun 17@WASLuinder AvilaW 2-6
Jun 18VS STLNoah CameronW 14-6
Jun 19VS STLSeth LugoW 6-5
Jun 21VS STLDustin May
ERA W-L HLD SV SO WLK WHIP GP
0.001-000310.821
Season stats based on this weeks opponents
Matchups Foster Griffin
DateOpponentResult
Jun 15VS KCBrad LordW 7-3
Jun 16VS KCPaxton SchultzW 6-4
Jun 17VS KCLuinder AvilaL 2-6
Jun 19@TBGriffin JaxL 5-2
Jun 20@TBMitchell ParkerW 3-4
Jun 21@TBNick Martinez
ERA W-L HLD SV SO WLK WHIP GP
1.500-000621.331
Season stats based on this weeks opponents
Next Up Ratings Comparison
Rating Stephen Kolek
8.72
FantasySP Player Rating
Rating Foster Griffin
10.87
FantasySP Player Rating
Next Up Career Comparison
Career Stephen Kolek
YEAR TM APP INN PC K WLK SV W-L ERA WHIP K/9 PTS
2024 SD 42 42.0 797 39 12 0 3-0 5.79 1.69 8.4 85
2025 SD 19 110.1 1689 77 31 0 5-7 3.59 1.17 6.3 216
2026 KC 8 50.1 737 34 10 0 4-1 2.68 1.03 6.1 129
ON PACE 16 106 1550 71 21 0 8-2 2.68 1.03 6.1 270
3-YEAR AVG 31 75 1243 58 22 0 4-4 4.32 1.35 7 150
Career 69 200.1 3223 150 53 0 0-0 3.86 1.26 6.7
Career Foster Griffin
YEAR TM APP INN PC K WLK SV W-L ERA WHIP K/9 PTS
2020 KC 1 1.2 23 1 0 0 1-0 0 0 5.4 8
2022 KC 6 7.1 111 4 5 0 0-0 7.36 1.64 4.9 5
2026 WAS 15 84.0 1372 80 23 0 7-2 3.32 1.11 8.6 217
ON PACE 31 177 2886 168 48 0 14-4 3.32 1.11 8.6 455
3-YEAR AVG 0 0 0 0 0 0 0-0 NAN NAN NAN 0
Career 22 93.0 1506 85 28 0 0-0 3.58 1.13 8.2
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Matchups

Week 1
ARI @LAC
ATL @PIT
BAL @IND
BUF @HOU
CAR vs CHI
CIN vs TB
CLE @JAC
DAL @NYG
DEN @KC
DET vs NO
GB @MIN
LAR vs SF
LV vs MIA
NE @SEA
NYJ @TEN
PHI vs WAS
Matchup Time Pitchers
ARI vs MIN 03:15 EDT EST Jose Cabrera
Mike Paredes
ATH vs LAA 04:05 EDT EST Jack Perkins
Reid Detmers
ATL vs MIL 01:35 EDT EST Bryce Elder
Robert Gasser
BAL @LAD 04:10 EDT EST Brandon Young
Emmet Sheehan
BOS @SEA 04:10 EDT EST Payton Tolle
Logan Gilbert
CHC vs TOR 02:20 EDT EST Shota Imanaga
Dylan Cease
CHW @DET 01:40 EDT EST Davis Martin
Keider Montero
CIN @NYY 01:35 EDT EST Chase Burns
Elmer Rodriguez
CLE @HOU 02:10 EDT EST Slade Cecconi
Kai-Wei Teng
COL vs PIT 03:10 EDT EST Michael Lorenzen
Jared Jones
KC vs STL 02:10 EDT EST Stephen Kolek
Dustin May
MIA vs SF 01:40 EDT EST Ryan Gusto
Logan Webb
NYM @PHI 07:20 EDT EST David Peterson
Zack Wheeler
SD @TEX 02:35 EDT EST Lucas Giolito
Nathan Eovaldi
TB vs WAS 01:40 EDT EST Nick Martinez
Andrew Alvarez
Matchup Time
No games scheduled
Matchup Time
No games scheduled