Go to the team selection screen. Hold R1 + R2 + L2 + L1 and press Up, Triangle, Right and Circle to unlock the teams of the Allstars from 1970s, 1980s and 1990s. When you have done this action correct, you will hear a sound.
Big ball
Throw three strikeouts in a row with the same pitcher.
Big bat
Hit two homeruns in a row with the same player.
Big glove
Catch a ball that is going over the fence or make a diving catch.
Big head
Score four runs in a game with a team.
Bonus stadiums
You can unlock certain stadiums by doing the following things. Note: These stadiums will appear after you complete the game you are playing in season or single mode in the stadiums option.
Island Stadium: Win by three or more runs in Pacific Bell Park (Giants), Kauffman Stadium (Royals), Edison International Field (Angels) or Coors Field (Rockies).
Space Stadium: Hit a ground rule double. Its easier to hit them on parks that have turf like the Skydome (Blue Jays) or Veteran's Stadium (Phillies).
CPU assist
Score ten or more runs to win a game.
Fast players
Steal three bases with the same player in a single game.
Flaming baseball
Throw nine strikeouts in a row with the same pitcher.
Grand slam batter
Create a player and enter "SLUGGER" as a name. He will always hit a grand slam if batting with the bases loaded.
Hitting homeruns
Go to create a player mode. Make a 100 ranked player. Go to One On One in Triple Play Challenge to hit homeruns.
When batting against the CPU, show for a bunt and the computer will pitch a fastballl 99.9% of the time. Your batter can hit a homer if at 75 or more power.
Homerun sounds
While running around the bases after hitting a homerun, press Triangle to hear a soft horn, Square to hear a loud horn, or Circle to hear a whistle.
Huge baseball
Throw six strikeouts in a row with the same pitcher.
Huge glove
Make two diving or wall-climbing catches in a game.
Huge head
Score eight runs in a game with a team.
Invisible players
Hit three triples by a team in a single game.
Large players
Hit one home-run in a game with a player who weighs over 250 pounds.
Long homeruns in Home Run Derby
When you play at Cashman's field in Home Run Derby mode, the ball travels very far. It is possible to hit one 665 feet with Manny Ramirez.
Pencil head
Strikeout against the CPU six times.
Power-up defense
Make three double plays in a single game.
Power-up offense
Hit eight home-runs in a game with a team.
Power-up speed
Steal six bases in a game with a team.
Pulsating bat
Score five runs with the same player in a single game.
Pulsating glove
Make three diving or wall-climbing catches in a game.
Pulsating head
Score twelve runs in a game by a team.
Skinny players
Hit a home-run with a player who weighs less than 150 pounds.
Small players
Get more than eleven hits in a single game.
Strong arm
Get two pick-offs, caught stealing, or outfield assists with the same player.
Tall players
Get eight hits in a game with a team.
Tiny head
Get sixteen hits in a game with a team.
Tiny players
Get twelve hits in a game by a team.
Unlimited creation points
Create a player and enter Ichiro as a name.
World Tournament
Win a World Series in season mode only (not playoff mode) to compete in a world tournament versus the World Team, the Puerto Rico team, the Dominican team, the USA team, and the EA Dream Team. Note: The teams are listed in corresponding order. Win the championship versus the World team and move on to the Puerto Rico team. If you lose a game, you will not be able to play the other teams until you win another World Series.