I am assuming you mean 'when did it change from single-handed to 2-handed'?
I think it mainly changed in the earlier days of Jimmy Connors and his girlfriend of the time, Chris Evert, who were both virtually top-ranked in the world. Both of them were using two-handed backhands.
Then, not long later, Bjorn Borg and Ivan Lendl had long-term great success using top-spun backhands - which had been somewhat of a rarity up until that point. With the advent of more European clay courts, the top-spin backhand established its place.
So, in effect, as grass became a less favourable surface in the world, top-spun backhands have become more 'the rage', and much more use of the two-hander as well - even for many forehands.
The 2008 Davis Cup USA vs- Spain - 2008 was released on:
USA: 19 September 2008
Standard rules call for eight per team.
Please see the Related link below for link to rules on Tug of War Teams.
The Davis Cup is an international tennis event played between male players of those countries entering. Therefore, each country will have its own captain.
In the US, for the past several years (10 I think) it has been Patrick McEnroe, but this year the U.S. changed coaches. Jim Courrier is the new coach for the U.S Davis Cup team.
The new Australian team captain, as of 2010, is now Patrick Rafter, replacing the former captain, John Fitzgerald - now retired.
The current captain of the Indian Davis Cup team is Mahesh Bhupathi.
Probably most male tennis players wear either a jockstrap or some kind of supportive sports undergarment, e.g. compression shorts, jock boxers, athletic briefs, etc.
Federer - The Fed Express
Sampras- Pistol Pete
Andy Roddick- A. Rod
Djokovic- The Djoker
According to the Fed Cup Official Website (refer to the link, below), the women's Federation (Fed) Cup was created in 1963 to celebrate the 50th Anniversary of the International Tennis Federation. Similar to the men's Davis Cup tournament, professional women tennis players from many nations compete in this event.
India reached the finals of the Davis Cup in 1966, 1974 and 1987.
However, they have never won the Davis Cup.
Rohan Bopanna is a professional Indian tennis player, currenly [2011] ranked #2 in India, though he is probably a better doubles than singles player internationally, having reached an ATP doubles ranking of #56.
In 2005, there were 134 countries represented in competition.