The correct answer is 15 minutes. Players are entitled to an interval at half-time, not exceeding 15 minutes; a short drinks break (which should not exceed one minute) is permitted at the interval of half-time in extra time.

Tennis is a game played on a rectangular-shaped court, which can be one of many surfaces. It is either played with two players (singles match), or four players (doubles match). Players stand on opposite sides of the net and use a stringed racquet to hit the ball back and forth to each other. Most tennis matches are played in a best-of-three format, which means that players need to win 2 sets to win the match. The score when the receiver wins the next point after deuce Advantage out. In Grand Slams, men play best-of-five sets while women play best-of-three sets. Doubles matches are best-of-3 with a 10-point tiebreak in lieu of the third set. USTA and club matches are usually best-of-3. There are two main ways of scoring a set. Advantage Set In an advantage set, a player or team needs to win six games, by two, to win the set. This means that there is no tiebreak game played at 6-6. The set continues until one player/team wins by two games. Tiebreak Set In a tiebreak set, a player or team needs to win six games wins a set. If the score gets to 5-5 (5-all), one player must win the next two games to win the set. If the score reaches 6-6 (6-all) in the set, a tiebreak game is played.

Pankaj Arjan Advani is an Indian billiard and former professional snooker player.

Jeev Milkha Singh is an Indian professional golfer who has represented India in various international golf championships. He was born on December 15, 1971, in Chandigarh, India. Jeev is the son of former Indian athlete Milkha Singh, who is also known as the "Flying Sikh."

Canada's official national sports are ice hockey (winter official) and lacrosse (summer official).

Angelique Kerber is a German professional tennis player and former world No. 1, and a three time Grand Slam champion. Having made her professional debut in 2003, Kerber rose to prominence upon reaching the semifinals of the 2011 US Open as the No. 92 ranked player in the world.

Roger Federer, a Swiss professional tennis player, won the 2018 men's Singles title in the Australian Open 2018. He successfully defended his title by defeating 6th seeded Marin Cilic of Croatia by 6-2,6-7, 6-3 3-6, 6-1.

The correct answer is Table tennis. Table tennis is the national sport of China. China has not formally declared a national sport. On the basis of popularity, table tennis is considered the national sport of China.