Rob Thomson
Decision cost by category
Season to date · categories cover different scopes and aren't summed into a total — reliever selection is high-leverage spots only; the Relievers leaderboard shows a rolling 30-day window.
Cost by category
Through Thomson's tenure, the Philadelphia Phillies cost themselves 1.81 R from lineup decisions, 5.78 R from high-leverage reliever selection, 0.00 R from bunts, 0.61 R from intentional walks.
Season to date · shown per category, not summed — reliever selection is high-leverage spots only (the Relievers board uses a rolling 30-day window).
How this compares — league ranking
Lineup decisions
Rob Thomson ranks 30th of 30 managers in MLB.
- 1 Dave Roberts LAD 1.34 R
- 2 John Schneider TOR 1.60 R
- 3 Craig Stammen SD 1.73 R
- 28 Joe Espada HOU 4.57 R
- 29 Will Venable CWS 4.91 R
- 30 Rob Thomson PHI 1.81 R
Bunt decisions
Rob Thomson ranks 1st of 30 managers in MLB.
- 1 Rob Thomson PHI 0.00 R
- 2 Aaron Boone NYY 0.28 R
- 3 Don Kelly PIT 0.56 R
- 28 Kevin Cash TB 3.63 R
- 29 Torey Lovullo AZ 3.64 R
- 30 Pat Murphy MIL 3.77 R
Intentional walks
Rob Thomson ranks 17th of 30 managers in MLB.
- 1 Joe Espada HOU 0.49 R
- 2 Clayton McCullough MIA 0.88 R
- 3 Chad Tracy BOS 0.68 R
- 17 Rob Thomson PHI 0.61 R
- 28 Kurt Suzuki LAA 3.96 R
- 29 Dave Roberts LAD 3.95 R
- 30 Pat Murphy MIL 4.78 R
Predecessor / successor
- Games
- 29
- Record
- 10-19
- Lineup cost
- 1.81 R (0.06 R/G)
- Bunts
- 0.00 R (0)
- IBBs
- 0.61 R (3)
- Games
- 84
- Record
- 51-34
- Lineup cost
- 1.95 R (0.02 R/G)
- Bunts
- 0.93 R (8)
- IBBs
- 1.14 R (6)
Don Mattingly took over on April 28, 2026 after Rob Thomson was fired. Through their first 84 games, Mattingly's lineup decisions cost 1.95 R compared to Thomson's 1.81 R across 29 games.
Tenure summary
Rob Thomson managed the Philadelphia Phillies from March 26, 2026 to April 28, 2026, when they were fired and replaced by Don Mattingly.
Through 29 games of decision data, their tactical decisions cost the team an estimated 2.42 R across lineup construction, bunt strategy, and intentional walks. Lineup decisions accounted for 1.81 R of that — the largest single category.
After 10-19 through 29 games, the front office made the change. Under Don Mattingly, lineup cost has shifted to 1.95 R across 84 games. Intentional walks have been issued 3 times for an expected cost of 0.61 R.
Deep analytical views
The overview above is the SEO surface. Each link below opens the interactive analyzer for that decision type — sortable lists, per-game breakdowns, and the underlying numbers.
How this is calculated
Stats reflect only Rob Thomson's tenure as Phillies manager — events from before the start date or after the end date are excluded. Lineup cost is the difference between an optimized batting order and the one actually used, summed across regular-season games. Bunt and intentional-walk costs come from per-decision run-expectancy deltas. Pitching cost is the sum of pull-timing and reliever-selection runs lost. Costs are shown as a season total and a per-game rate (R/G); rankings compare this tenure's per-game rate against the league-wide distribution of current and recent manager tenures. RunsLeft does not assign letter grades — the costs and rankings are descriptive analytics.
Read the full methodology. Career managing history coming in v2 with Lahman integration.