Is GoatLab free to play?

Yes. Every game runs in your browser with no download and no payment. An optional account saves your builds, and optional extras exist, but the games themselves are free.

Do I need an account?

No. You can play, post scores and take on the daily challenge as a guest. Signing in with Google just saves your players to a personal Hall of Fame and carries your progress between devices.

Where do the player ratings come from?

Attributes are derived from real tour statistics: first-serve points won, hold percentage and aces feed the serve, return points won and break points feed the return, tiebreak and break-point records feed the mental rating, and match volume feeds stamina. Retired greats appear as legend cards rated on their whole careers.

What can my player win?

The career simulation includes tour titles, Masters 1000 and WTA 1000 titles, the Tour Finals, weeks at world number one, year-end number one seasons, all four Grand Slams and the Tennis Hall of Fame.

Tennis Player Builder: Build an ATP or WTA Player and Sim the Career

Menu

LeaderboardFull rankings ↗

🏛️ My Hall of Fame

Build Breakdown

Screenshot the card above to post your build

How to Play

Build a tennis player out of real players, one attribute at a time. Pick a tour first: the ATP or the WTA.

Spin the reel. It stops on a random player from the 2026 US Open draw, or a purple legend from the history books.
Assign that player to one of the 9 slots. Each slot is an attribute like Serve, Return or Mental, and the slot takes that player's rating for it. The kit tints in the player's flag colours.
Fill every slot to finish your player and reveal their Overall. Card colors show how strong a player is, from grey up to diamond, with purple for legends. The 🔥 US Open finalists run hot: +10 on every rating until the trophy is handed out.
Simulate Career to play it out season by season: earn a ranking, chase tour titles, the Masters, the Tour Finals, weeks at #1 and the four Grand Slams. The record book is 24 Slams on either tour.
Name your player and post them to the leaderboard.

Power-ups

You get one of each per run.

Re-spin: toss the current player and spin for a new one.
Boost: upgrade the current player to their Prime card, their best real season, then assign them.
Snag: grab the player one spot to the left or right of where you landed.

Tip: your Overall decides where you enter the tour. A 92+ build gets wildcards and a seed by summer; a 70 starts on the challenger circuit and has to climb.

📊 What matters most

Your Overall is a weighted average · these slots count extra, best first:

1.2×	Serve, Return, Forehand · free points, break points, and the shot that ends rallies. Best ratings here.
1.1×	Backhand, Mental, Movement · the second wing, the tiebreaks, and getting to every ball.
1.0×	Stamina, Experience · steady value, and both stretch how long the career lasts.
0.4×	Frame · height helps the serve a little, and the rating knows it.

Decision · Age Paused

⚙ Sim settings

Playback speed

Decisions per careeronly when you Sim with Decisions

The coaching split and the twilight call are always in. Three adds the rivalry. Five adds the story beats and the injury call. More decisions means more pauses, not bigger swings.

⚔️ Shared Career

🔥 Your Streak

0Current 🔥

0Best Ever

🔥 played · 🎯 today · freeze earned · 🏆/🐐 milestone

-PRIMENEW🔥 HOT

Player Complete

Power-ups