Kai-Wei Teng

SP/RP · R/R · age 27.8 · HOU

OCTOBER OK

Roster status
OPTIONED
Service thru 2025
0+081
Service now / projected
1+048 / 1+048
Option years left (2026)
2 (using one in 2026)
Assignments left this season
3 of 5
Contract (2027)
PRE-ARBITRATION / AUTO-RENEWAL
Acquired
Trade (SFG) Jan'26
Outrighted / DFA'd before
0 / 1
Contract
none listed

Next 90 days, by the model

Stays put
75%
Designated
3%
Optioned
20%
Traded
1%
Released or non-tendered
<1%

Pushing the cut risk around: this season's innings (73.20) lowers it, roster status (3) raises it, this season's WAR (0.17) raises it.

Context the model does not weigh: ZiPS projects 0.4 WAR, 0.2 WAR this season; 17 OF on the 40-man, of whom Daulton Varsho, LaMonte Wade Jr are headed to free agency.

Trained on every 40-man roster snapshot since 2011 and what happened in the following 90 days; it sees roster status, options, service, history and last season's line, not this season's performance or the club's intentions. How well it does.

Is there a job for him next year?

HOU returns 15 IF on the 40-man once 1 free agent leaves; about 8 IF jobs survive a normal winter. By his own recent record he ranks 10th among the returners (0.3 WAR against a bar of 0.9), which the calibrated model turns into 85% kept through the tender deadline. Ranked by ZiPS and Steamer instead, which credit his longer track record, he is 12th (0.3 WAR, bar 1.0), worth 86% kept on the same model.

By recent record: returning IFProj. WAR
1. Yordan Alvarez4.3
2. Jeremy Pena3.9
3. Carlos Correa3.3
4. Isaac Paredes3.3
5. Jose Altuve1.6
6. Christian Walker1.4
7. Joey Loperfido1.1
8. Nick Allenlast job0.9
9. Zach Cole Jr.0.4
10. Kai-Wei Teng0.3
11. Brice Matthews0.3
12. Collin Price-0.1
By ZiPS / Steamer: returning IFProj. WAR
1. Yordan Alvarez3.9
2. Jeremy Pena3.5
3. Isaac Paredes2.8
4. Carlos Correa2.7
5. Jose Altuve2.4
6. Christian Walker1.4
7. Brice Matthews1.2
8. Joey Loperfidolast job1.0
9. Zach Cole Jr.1.0
10. Nick Allen0.6
11. Raynel Delgado0.6
12. Kai-Wei Teng0.3

Departing free agents are excluded; players on club, mutual or player options are counted as returning. The kept probability is calibrated on every September since 2012 using the recent-record projection; the ZiPS/Steamer reading uses the same model with a different ranking, so treat it as a second opinion rather than a calibrated number. Salary enters once arbitration projections publish in October.

October: Post-season eligible

On the 40-man before noon ET Sep 1. He stays eligible as long as he remains on the 40-man or 60-day IL through the post-season; an outright after the cutoff would end automatic eligibility.

The post-season eligibility list is fixed at noon ET on September 1: everyone on the 40-man, the 60-day IL or the military list at that moment, who then stays there without interruption. Attachment 25 (Major League Rule 40)

What happens if the club…

option him to the minors
Yes, 2 option years left. 3 of the five optional assignments for 2026 remain. A 2026 option year is already used (35 days), so further trips this season cost nothing extra. Once down he must stay 10 days unless he replaces an injured or traded player.
Option years and the 20-day rule · Five optional assignments per season · Minimum stay on option
designate him for assignment (or put him on outright waivers)
The club has 7 days to trade him, pass him through outright waivers, or release him; he is paid at the major-league rate and keeps accruing service in the meantime. On outright waivers any club can claim him for $50,000, worst record first, and the claiming club takes his contract. If he clears, the club can outright him to the minors and he has no say; he stays under club control on a minor-league deal. He would then be Rule 5-eligible and would hold XX-D rights against any future outright. Post-season: an outright after the September 1 cutoff ends his automatic eligibility. He could only return as an approved injury replacement, and only if he accepts the outright and stays on a minor-league reserve list in the organization without interruption; a release makes him ineligible for anyone this October.
Designated for assignment: 7 days · Outright waivers · Article XX-D: the right to walk
release him
Release waivers cost a claiming club $1 but the claimant assumes the whole contract, so expensive players clear. The club owes the full unpaid balance of this season's salary, offset by whatever another club pays him this year. A released player is not post-season eligible for any club this year.
Release waivers and termination pay · Which rate a split contract pays at release
trade himBLOCKED
Not now: players on major-league contracts cannot be traded after the Aug 3 deadline until the day after the World Series.
Trade deadline · 10-and-5 rights · June 15 no-trade for free-agent signees
renew him for next year
Pre-arbitration: the club sets his 2027 salary near the minimum ($780,000 floor) and he has no leverage beyond a non-tender.
Minimum salaries · Tender deadline

What the rules say about him

Option years, season by season

SeasonDays on optionOption year usedStints
202635yesJul 26, 2026 to Aug 21, 2026 (26d)Sep 6, 2026 to now (9d)
202510no (under 20)Aug 21, 2025 to Aug 31, 2025 (10d)
2024173yesMar 11, 2024 to Mar 29, 2024 (9d, spring training)Apr 20, 2024 to Oct 1, 2024 (164d)

Transaction log

Sep 6, 2026OptionedHouston Astros optioned RHP Kai-Wei Teng to Sugar Land Space Cowboys.
Aug 21, 2026RecalledHouston Astros recalled RHP Kai-Wei Teng from Sugar Land Space Cowboys.
Jul 26, 2026OptionedHouston Astros optioned RHP Kai-Wei Teng to Sugar Land Space Cowboys.
Jul 17, 2026Status changeHouston Astros activated RHP Kai-Wei Teng from the 15-day injured list.
Jan 30, 2026TradedSan Francisco Giants traded RHP Kai-Wei Teng to Houston Astros for C Jancel Villarroel and Future Considerations.
Aug 31, 2025RecalledSan Francisco Giants recalled RHP Kai-Wei Teng from Sacramento River Cats.
Aug 21, 2025OptionedSan Francisco Giants optioned RHP Kai-Wei Teng to Sacramento River Cats.
Aug 1, 2025Contract selectedSan Francisco Giants selected the contract of RHP Kai-Wei Teng from Sacramento River Cats.
Nov 29, 2024Signed as free agentSan Francisco Giants signed free agent RHP Kai-Wei Teng to a minor league contract.
Nov 22, 2024Declared free agentRHP Kai-Wei Teng elected free agency.
Nov 19, 2024Designated for assignmentSan Francisco Giants designated RHP Kai-Wei Teng for assignment.
Oct 1, 2024RecalledSan Francisco Giants recalled RHP Kai-Wei Teng from Sacramento River Cats.
Apr 20, 2024OptionedSan Francisco Giants optioned RHP Kai-Wei Teng to Sacramento River Cats.
Mar 29, 2024RecalledSan Francisco Giants recalled RHP Kai-Wei Teng from Sacramento River Cats.
Mar 11, 2024OptionedSan Francisco Giants optioned RHP Kai-Wei Teng to Sacramento River Cats.
Nov 14, 2023Contract selectedSan Francisco Giants selected the contract of RHP Kai-Wei Teng from Sacramento River Cats.
Jul 31, 2019TradedSan Francisco Giants traded RHP Sam Dyson to Minnesota Twins for RF Jaylin Davis, RHP Kai-Wei Teng and RHP Prelander Berroa.
Oct 20, 2017Signed as free agentMinnesota Twins signed free agent RHP Kai-Wei Teng to a minor league contract.

Service through 2025 per FanGraphs RosterResource; options and this-season service reconstructed from the MLB transaction log (reconstruction; FanGraphs shows 2). Rule 5 exposure deadline Nov 17, 2026.