Pennant Run Research

Scout, build, and play

Explore player seasons, build a team, test a matchup and play a game. Solo vs AI, Local 1v1 and private Online play use the same Simulation model. Choose whether to make decisions each pitch or once per plate appearance.

• Scouting Reports: examine a player's available seasons, career view and advanced statistics.
• Roster Workshop: choose players and positions, save your teams, or import and export a roster.
• My Collection: record physical card copies and photos on this device. Signed-in users can register slab or serialized card details for transfers and disputes; registration records an account claim, not verified ownership or grade.
• Matchup Lab: compare batter-pitcher outcomes, inspect retained historical matchups and run retrospective simulation checks.
• MLB Games: choose a date and explore an available game, including supported historical games.

How play works

Select teams and a game pace in Quick Play. Set lineups, then manage substitutions and meaningful runner decisions. Automatic play is available when you want the simulation to continue. Start a new series with rested players; workload and fatigue carry within the series. Local and anonymous exhibition do not require an account.

Competition rooms

Play with two to eight managers in a private invitation room or find a public room. AI can fill open seats. Choose available player seasons, venue and game pace, then play an elimination bracket or a single round robin. Each matchup is a best-of-1, 3, 5 or 7 series. In a round robin, every club plays every other club once. Standings use series wins, then series wins among tied clubs, overall game win percentage and the original seeded draw. A champion is named after all rounds finish. You can join a private room without an account. Public rooms require sign-in and a confirmed public handle. There are no entry fees or rewards.

Build a team with a positional snake draft, passing packs at an eight-manager table, a random 40-player limited pool, or a Saved Team. By default, passing packs give each manager three packs of 15 players. Choose one player and pass the rest on each turn; the packs move left, right, then left. Free picks help fill an underfilled team. A playable roster needs nine batters and a separate pitcher; an emergency player out of position can play with a defensive adjustment. Half the packs include one qualified catcher, and half include two. You can use qualified positions and related defensive moves; any game-defense adjustment appears before you lock the lineup. Limited pools include 7 starters, 12 relievers, 3 catchers, two players at each other defensive position, and 4 extra fielders with more shortstop and center-field depth. Once you choose a player, no one else can select another season of that player in the event.

Constructed rooms can use point-buy: each club has 650 points for all 26 players. Start with an affordable team and make substitutions in Roster Workshop, or import a Saved Team and bring it within budget. Prices use PRR pWAR adjusted for playing time and season length; every player costs at least 5 points. The same full price applies in the lineup, on the bench and throughout the pitching staff. These are game prices, separate from player ratings. Constructed rooms without a points limit remain available.

Once enough people are ready, the room waits up to two minutes so others can take seats that AI would otherwise fill; a unanimous Start vote can begin sooner. Snake picks have a 30-second limit. Passing-pack picks allow four seconds per card on the first circuit and two seconds per card on later circuits. Managers have five minutes to set a lineup. During games, plate-appearance mode allows 15 seconds between batters. Pitch-by-pitch mode allows 15 seconds between pitches and 30 seconds between batters. Both allow 90 seconds when sides change. If time runs out, the game makes a legal default choice and continues. The game service checks picks and rosters and resolves each game.

Public-room entry depends on account availability. Older private two-player rooms finish under their original rules and leave completed reports; unfinished rooms cannot be resumed. Signed-in accounts can view private competition history and win-loss records, including completed results; history cannot reopen a seat. The public room browser shows limited room summaries. Draft picks, account IDs and private seat credentials stay private. Rewards and persistent leagues are not part of these rooms.

Simulation outcomes are modeled results, not forecasts or historical replays of the literal outcome. Advanced-data coverage varies by season and source.

Open Quick Play and its in-game How to Play guide →

Browse public player profiles · Explore leaderboards · Understand pWAR