A prefix is a series of letters, or a word, that is added to the  beginning of a word and changes the meaning. For example, in the  word midnight, mid is the prefix.
The more vigorous an activity, however, the more calories youâll burn. Changes in body weight are related to both the duration and intensity of play. Playing singles tennis at average intensity expends 300-600 kcal/h, while high intensity tennis training expends 450-900 kcal/h. Diabetes. The incidence of diabetes worldwide of persons aged 20 or above in 1995 was 4% (approx. 135 million), a figure that will increase to approx. 5.4% (300 million people) by 2025.
Keep in mind that in order to win a game, a competitor must have a two point advantage - therefore, 7-6 will not win a '7 Point Tiebreak' game. The game must continue until one of the tennis competitors closes out the set with a final tennis score of 8-6, 9-7, 10-8, 11-9, 12-10, etc. for the '7 Point Tiebreak' game. The '7 Point Tiebreak' game is the final game after twelve games have been played and the game score is tied (6-6) for the set. In tennis, this is the only time a tennis competitor closes out a set by winning with a one game advantage resulting in tennis game score of 7-6 or 6-7.