The official NBA weight is 22 ounces (avoirdupois) which is 623.7 grams.
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Basketballs actually come in four sizes:
Size 3: circumference 22 to 22.5 inches, weight 10-11 ounces (283.5 to 311.8 g)
Size 5: circumference 27.25 to 27.75 inches, weight 16.6-18 ounces (470.6 - 510.3 g)
Size 6: circumference 28.5 to 29 inches, weight 20 ounces (567 g)
Size 7: circumference 29.5 to 30 inches, weight 22 ounces (623.7 g)
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The mass of a tennis ball is between 56.7g and 57g.
The weight is usually between 2 and 2 1/16 ounces (57.7 and 58.5 grams).
Basketballs weigh about 22 ounces. 22 oz = 0.623689 kg, so in kilograms they are about 0.62 kg.