Play as Boris Becker - Successfully complete Singles in Arcade mode to unlock Boris Becker.

Play as Duke - Reach the number one rank in Professional mode to get invited to the King Of Players tournament. Win the tournament to play against Duke. Defeat Duke to unlock him.

Play as King - Reach the number one rank in Professional mode to get invited to the King Of Players tournament. Win the tournament twice to play against King. Defeat King to unlock him.

Play as Stefan Edberg - Successfully complete Doubles in Arcade mode to unlock Stefan Edberg.

Play as Tim Henman - Successfully complete all Tennis Academy Challenges on both the Beginner and Advanced difficulty to unlock Tim Henman.

World Tour training games - Successfully complete the indicated task to unlock the corresponding training game:

Alien Attack: Successfully complete Meat Defender Level 4.
Avalanche: Successfully complete Zoo Feeder Level 4.
Count Mania: Successfully complete Avalanche Level 4.
Court Curling: Successfully complete Pot Shot Level 4.
Drum Topple: Successfully complete Alien Attack Level 4.
Meat Defender: Successfully complete Pirate Wars Level 4.
Pin Crusher: Successfully complete Court Curling Level 4.
Pot Shot: Successfully complete Block Buster Level 4.
Zoo Feeder: Successfully complete Shopping Dash Level 4.

Fancy costumes - Successfully complete all levels of the indicated mini-game in World Tour mode to unlock the corresponding costumes for purchase. They must be worn in order to enter the Fancy Dress-only tournament.

Action Hero costume: Drum Topple (using a male player)
Bowling costume: Pin Crusher
Karate costume: Avalanche
Mariachi costume: Blockbuster
Mime costume: Count Mania (using a male player)
Pajamas costume: Court Curling
Pirate costume: Pirate Wars
Sheriff costume: Pot Shot
Skeleton costume: Meat Defender
Superhero costume: Shopping Dash
Zookeeper costume: Zoo Feeder

Concept rackets - Win the Davis and/or Fed Cups on the Professional difficulty the indicated number of times to unlock the corresponding concept racket:

Emerald: Four times
Fire: Two times
Panther: Six times
Rainbow: Three times
Squished: Five times
SuperDrive: One time

Medals - Successfully complete the indicated task to unlock the corresponding medal:

Academic Excellence: Successfully complete ten Academy exercises in gold.
Ambassador: Win three Davis or Fed Cup matches.
Artificial Court Legend: Win 100 Artificial court matches.
Artificial Court Specialist: Win 20 Artificial court matches.
Avid Shopper: Purchase 35 items from the Tennis Store.
Big Spender: Purchase 50 items from the Tennis Store.
Career Gamer: Successfully complete Level 8 on six different Training Games in World Tour.
Career Trainer: Successfully complete Level 8 on a Training Game in World Tour.
Chameleon: Win as all the different famous players.
Clay Court Legend: Win 100 Clay court matches.
Clay Court Specialist: Win 20 Clay court matches.
Clean Sheet Expert: Win 100 Love Games.
Clean Sheet Specialist: Win 25 Love Games.
Compelling Company: Make friends with 15 players in World Tour.
Dress Up Obsessive: Play 20 matches in Fancy Dress.
Drop Shot Expert: Win 15 points with Drop shots.
Drop Shot Master: Win 75 points with Drop shots.
Early Training Days: Win three different training games in World Tour.
Exhibitionist: Play 20 Exhibition matches in Play mode.
Fancy Dresser: Play one match in Fancy Dress.
Feared Opponent: Awarded for beating all the famous players.
Friendly Nature: Make friends with five players in World Tour.
Grass Court Legend: Win 100 Grass court matches.
Grass Court Specialist: Win 20 Grass court matches.
Highly Versatile: Unlock 10 Advanced Playstyles.
Later Training Days: Win eight different training games in World Tour.
Lob Shot Expert: Win 50 points with Lob shots.
Lob Shot Master: Win 75 points with Lob shots.
Long Distance Runner: Run 10 kms / 6.2 miles.
Marathon Runner: Run 50 kms / 31 miles.
National Hero: Win the Davis or Fed Cup.
Online Touring Expert: Win 30 Online Tour events.
Online Touring Legend: Win 75 Online Tour events.
Online Touring Specialist: Win five Online Tour events.
Perfect Server: Win 50 points with an Ace.
Right Of Way: Purchase five court passes from the Tennis Store.
Slice Shot Expert: Win 100 points with Slice shots.
Slice Shot Master: Win 500 points with Slice shots.
Smash Master: Win 100 points with a Smash.
Smash Specialist: Win 20 points with a Smash.
Student Days: Successfully complete 20 Academy exercises.
Stylish Player: Unlock 10 Playstyles.
Top Spin Expert: Win 200 points with Top Spin shots.
Top Spin Master: Win 750 points with Top Spin shots.
Tournament Player: Play five tournaments in Play mode.
Training Player: Play 20 Training Games in Play mode.

Trophies - Successfully complete one of the following tasks to get a trophy:

...One Giant Leap (Bronze): Win your first tournament in world tour.
Access all Areas (Silver): Purchase every court pass in World Tour.
Aces High (Bronze): Score 100 aces.
Arrrrrrh! (Bronze): Sink 3 galleons in a single game of Pirate Wars.
Astro-Carpet King (Bronze): Play 100 matches on an Artificial Court.
Big Hitter (Bronze): Achieve 250 max serves.
Block and Roll (Bronze): Clear a 15 block combo in Block Buster.
Breaking the Speed Limit (Bronze): Hit a serve over 200kph/124.28mph.
Cherry Picker (Bronze): Collect 10 cherries in a single game of Avalanche.
Competitive Streak (Bronze): Complete 10 ranked online games in World Tour.
Coronation (Gold): Win King of Players tournament in World Tour.
Different Strokes (Bronze): Win 400 stroke points.
Dr. Doolittle (Bronze): Feed all types of animals in Zoo Feeder.
Drop and Give Me 50! (Bronze): Win 50 drop shot points.
First Among Equals (Gold): Rank #1 in the world in World Tour.
Fore! (Bronze): Hit a line judge.
Go Pro! (Silver): Turn professional in World Tour.
Gold Medalist (Bronze): Unlock every gold medal in the game.
Grass Stains (Bronze): Play 100 matches on a Grass Court.
Ham and Eggs (Bronze): Turkey on level 6 or above of Pin Crusher.
King for a Day (Bronze): Unlock secret player King.
Last Man Standing (Bronze): Beat all default male pro players.
Last Woman Standing (Bronze): Beat all female pro players.
Leader of the Pack (Silver): Become the number 1 amateur in World Tour.
Loving It (Bronze): Achieve 25 love games.
Make friends and influence people (Bronze): Make friends with 8 characters in world tour.
Marathon Man (Bronze): Run a total of 10km/6.21 miles.
National Treasure (Silver): Win the Davis or Fed Cup in World Tour.
One Small Step.. (Bronze): Win your first match in the world tour.
Over the top (Bronze): Win 50 lob shot points.
Perfect Frame (Bronze): Clear the table of balls in order without missing in Pot Shot.
Platinum (Platinum): All trophies unlocked.
Play with Clay (Bronze): Play 100 matches on a Clay Court.
Practice Makes Perfect (Bronze): Win 10 practice matches in world tour.
Pushing it to the Max! (Bronze): Achieve 3 consecutive max serves in a match.
Quick and Easy (Bronze): Play 25 events in Play mode or Network Games mode.
School's Out (Bronze): Clear each academy mission in World Tour.
Shopaholic (Bronze): Purchase 100 different items from the shop in World Tour.
Social Animal (Bronze): Complete 10 friendly online games.
Style Guru (Silver): Use every basic play style in World Tour.
Super, Smashing, Great! (Bronze): Win 200 smash points.
Thats Duke's a Hazard! (Bronze): Unlock secret player Duke.
Them Bones (Bronze): Play the Meat Defender training game wearing the full Skeleton clothing set.
Training to Win (Bronze): Clear a level 8 training game in the world tour.
Versatile Female (Bronze): Win a match with all female pro players.
Versatile Male (Bronze): Win a match with all default male pro players.
Vollyball (Bronze): Win 300 volley points.
You are Gold! (Gold): Complete every academy mission with a gold medal in World Tour.
Your Country Needs You! (Bronze): Be selected for the Davis or Fed Cup team in World Tour.

Additionally, there are two secret trophies:

To be this good takes AGES (Bronze): Score an ace with an underarm serve.
To be this good takes SEGA (Bronze): Play a game dressed in the complete SEGA outfit.