Gender; there is a man and a woman on each team.
Yes. Mens Doubles, Ladies Doubles and Mixed Doubles are permitted forms of Doubles in Tennis.
Mixed Doubles
Mixe doubles in tennis is where two people of opposite genders (a man and a woman!) team up on one side of the court, and another team consisting of a man and a woman oppose them. This is mixed doubles. You can also have mens doubles or womens doubles, this is where two teams of the same gender play against each other.
A standard tennis ball as defined by the International Tennis Federation (ITF).
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2
Sabine is happiest in mixed doubles
The silver medalists in the Mixed Doubles Tennis Tournament event at the Rio 2016 Olympics were Venus Williams and Rajeev Ram.
The country winning the bronze medal in the Mixed Doubles Tennis Tournament at the Rio 2016 Olympics was the Czech Republic.
one woman and one man in each team
The country that won the gold medal in the Mixed Doubles Tennis Tournament event at the Rio 2016 Olympics was the United States.
The silver medal and the gold medal in the Mixed Doubles Tennis Tournament event at the Rio 2016 Olympics went to the United States.