1. One of your arms is slightly bigger than the other.
Manuela Davies / Via Getty Images Sport
2. Tennis balls are everywhere. In your home, your car, your bags, your shoes, under your bed.
Pool / Via Getty Images Sport
3. You are familiar with the inevitable tan lines.
Mike Ehrmann / Via Getty Images Sport
4. You have a special affinity for a certain type of racket. And you cannot play with any other kind. It just doesn’t feel right.
Shaun Botterill / Via Getty Images Sport
5. All of your bags must be large enough to accompany your racket.
Matthew Stockman / Via Getty Images Sport
6. One word: callouses.
Mark Kolbe / Via Getty Images Sport
7. You love the sensation of opening a new pack of balls and the smell that comes along with it.
Ken Levine / Via Getty Images Sport
8. If someone asks you about your tension level you immediately think about your racket, not stress.
Dan Istitene / Via Getty Images Sport
9. You know that bagels and breadsticks doesn’t refer to food… but it’s just as damn exciting.
Clive Brunskill / Via Getty Images Sport
10. You are either Adidas or Nike. You are not both.
Bryan Bedder / Via Getty Images Entertainment
11. You have to apply a new overgrip before each game.
Clive Brunskill / Via Getty Images Sport
12. You know the courage, fear, and struggle that come with playing a tiebreaker on a third set.
Clive Brunskill / Via Getty Images Sport
13. And you will always worship Patrick Rafter for his serves and volleys.
Charlie Crowhurst / Via Getty Images Sport
14. You definitely aim for people. It’s a good strategy, sorry.
Cameron Spencer / Via Getty Images Sport
15. Double faulting is the worst feeling.
Mike Ehrmann / Via Getty Images Sport
16. Slamming your racket feels so wrong yet so right.
Matthew Stockman / Via Getty Images Sport
17. CLAY COURT PLAYERS = TERRIFYING.
Scott Halleran / Via Getty Images Sport
18. You have a very precise serving routine.
Clive Brunskill / Via Getty Images Sport
19. You remember your aces better than your birthdays.
Clive Brunskill / Via Getty Images Sport
20. You and your doubles partner share an impenetrable bond.
Al Bello / Via Getty Images Sport
21. And you still have nightmares about the ball that hit the net and bounced over. LIFE IS SO UNFAIR.
Clive Brunskill / Via Getty Images Sport