Focus on ball trajectory and how cleanly you hit the ball – this will then allow your brain to merge the technical instruction you’ve been working on with the natural way of movement that creates effortless power – and eventually sound tennis techniques will emerge that simultaneously produce a lot of effortless power and allow easy adjustments to different situations in the game.
The set is won by the first player (or team) to have won at least six games and at least two games more than his or her opponent. Traditionally, sets would be played until both these criteria had been met, with no maximum number of games. To shorten matches, James Van Alen created a tie-breaker system, which was widely introduced in the early 1970s. If the score reaches 6–5 (or 5–6), one further game is played. If the leading player wins this game, the set is won 7–5 (or 5–7). If the trailing player wins the game, the score is tied at 6–6 and a special tiebreaker game is played. The winner of the tiebreak wins the set by a score of 7–6 (or 6–7).
Outside Australasia, the single achieved modest commercial success. It peaked at number 78 on the Canadian Hot 100 and remained for five weeks on the chart. The track earned platinum certification from Music Canada, which denotes shipments of 80,000 copies in the country. The single had the similar position on the UK Singles Chart and was certified silver by the British Phonographic Industry for track-equivalent sales of 200,000 units, based on sales and streams. It also entered the top 100 of the German Singles Chart, where it reached number 83. Despite not entering the record chart of Norway, the song was certified platinum by IFPI Norway for exceeding sales of 10,000 units in the country. In the US, "Tennis Court" debuted at number 71, which was also its highest placement, on the Billboard Hot 100 chart dated 19 October 2013. The single spent 18 weeks on the chart and had sold 355,000 copies in the US by April 2014. It also reached number nine on the Hot Rock Songs, a Billboard auxiliary chart.
The rules of modern tennis have changed little since the 1890s. Two exceptions are that from 1908 to 1961 the server had to keep one foot on the ground at all times, and the adoption of the tiebreak in the 1970s. A recent addition to professional tennis has been the adoption of electronic review technology coupled with a point-challenge system, which allows a player to contest the line call of a point, a system known as Hawk-Eye.