Juan
there are 4 players in lawn tennis doubles.
Tennis players are allowed to make three challenges per set using the Hawk-Eye system to review line calls.
There are many tennis players training in Florida because they have some of the best tennis players in the world including Bolliteri tennis academy.
2 - 4 players.
There is always 128 players are selected.
Two or four.
4
223
2
two
In 2012 (figures issued in late 2013 by the French ministry of sports), the French Tennis Federation had 1,111,136 registered players. In number of registered players, tennis is second only to football in France. 30% of the registered players were women. Many people who are playing tennis only occasionally are not registered.
Two for playing singles Tennis and four for pairs.