YES means both players recorded a regular-season appearance for the same franchise in the same season. Preseason, practice squads, minor leagues, All-Star and national teams do not count.

Each matchup lasts seven seconds. Correct answers add one to your streak; a wrong answer or timeout ends the run. Your best is saved separately for every league and difficulty. Standard uses familiar names; Hard and Hall of Fame test deeper career and roster knowledge. All three keep the same seven-second clock.

NBA and NFL: ESPN career statistics. MLB: official MLB Stats API. Matchups are generated from verified appearance records. No AI-generated relationships.

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