Just like on offense, the point guard usually stays at the perimeter of the key or near the three point line on defense. This positions him well to guard the opposing team's point guard, essentially playing the reverse of the role that he played on offense. This allows you to put the pressure on the opponent's point guard that's needed to prevent him from simply shooting or driving to the hoop as soon as he get up court. As on offense, however, there are plenty of cases in which you'll need to move from this default position depending on what the offense does. For instance, if the point guard passes the ball to a teammate and then moves toward the hoop, you'll want to stay on him, denying him an easy path to the basket. In this case, there's a chance that he's looking to get the ball back under the hoop for an easy lay up, so stay between him and the hoop. It's a common saying in basketball that defense is 90% heart, 10% skill in other words, the strategy is simpler, but your physicality is more important. To be the most effective defensive player you can be, be conscious of the way you're using your body to guard your opponent. Below are some general defensive tips for point guards: Stay low. Keeping your shoulders low and your hips back while you guard an opponent makes it easier for you to react to his motions especially if he tries to blow around you. Keep your hands ready. Most defensive players keep at least one hand up when their opponent is within shooting range to block his shots. Many also like to keep one hand low to block passes and make steal attempts. Stay about an arm's length from your opponent. If you're too far away, your opponent may be able to get a shot off before you block him, but if you're too close, he'll have an easy time blowing around you. Have quick footwork. Use choppy, short steps like a lineman in football. The quicker your steps are, the quicker you'll be able to react to an opponent's change in direction. Since you're guarding the opponent's point guard, you'll need to be on the lookout for lots of passes. It's almost impossible to block every pass, and if you try to, your opponent will quickly learn to fake you out and go to the hoop. Instead, try to be aware of where the other offensive players are so that, when you see a pass coming, you can get in front of your opponent's pass right as he's making it for an interception attempt. The balance between pass-blocking and guarding the point guard is a tricky one, so point guard who are good on defense are highly prized. Because he's facing away from the hoop, it's usually harder for a defensive point guard to have a good idea of what's happening on the court than an offensive one. You may take quick looks behind you and to your sides to get a sense for the offense's positioning, but don't take your eyes off of your man for too long or he'll be wide open for a shot. As noted above, sometimes, the point guard is the only defender who's in position to defend against an opposing team's fast break. In this case, try to stay between the ball carrier and the hoop. Don't let him get ahead of you or he'll have an easy time scoring. Be ready to follow him all the way to the basket most fast breaks will end with a layup attempt. Fast breaks are extra-hard to defend against if two offensive players are coming at you at once. In this case, you'll want to avoid committing too heavily to either player. If you do, he'll pass it to the other one and you won't have time to react before he scores. Try to stay ahead of both players and between them and the basket. Balancing your attention between both players slows them down and gives the rest of your team time to catch up. If one player stops dribbling before he's very close to the hoop, be ready to box out the other player and go for the rebound. If either player has an easy shot near the hoop, be ready to block it.
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One-sentence summary -- Stay at the perimeter, guarding the other point guard. Use a strong defensive stance. Guard passing lanes. Prevent the offense's fast breaks.

The match is the term that refers to the entire playing time of tennis. A match is comprised of either the best of three sets, or the best of five sets (depending on your league). Each set is played best out of six games. One player serves per game. A game is generally won when a player (or team if you are playing doubles) wins four points. A point is started when one player serves, and the opponent hits it back and the point continues in a back and forth manner until one player hits it out or in the net. Keep in mind that a game might take seven points, or more, to end if, for instance, one player wins three points and another wins four. Each point is given its own value for each player: 1st point won is "15 points" 2nd point won is "30 points" 3rd point won is "40 points" 4th point won makes GAME (signifying the end of the game) During each game, it is the server's job to call out the score so that the opponent can hear it (unless you are actually playing in a professional setting in which they have a score keeper). You are always supposed to say your score, followed by your opponent's score. For example: If you have won two points and your opponent has won one, you would call out "30-15". If your opponent has won three points and you have won one, you would call out "15-40". Each set is played until one player or team (if you are playing doubles) has won six games. At the beginning of your serve, you must always call out the number of games each player or team has won, starting with your score. For example: If you have won four games, and your opponent has won two, you would call out "4-2" before beginning your "service game" (the game you serve the ball in, rather than receive). This refers to both games and sets. Here are some examples: If you both have a score of 40 to 40, then you have to win two points in a row in order to win the game. (See Step 3 below for more details). If you both have won 5 games, and the score is 5 to 5, then you will need to win two more games in a row to make it 7-5 in order to win the set. If it is 5 to 5 and you win the next game, the score becomes 6-5. If you lose the next game and the score is 6-6, you will need to win 8 to 6 in order to win the set. Some sets have had scores of 12 to 10 or even higher. Depending on the league you are playing in, you will either need to win three out of five sets, or two out of three sets. However, like with games and sets, you must win by two. That means that matches can sometimes be five out of seven sets, or even seven out of nine sets if you and your opponent keep tying. On a scorecard, you should write the score of each set down. You should always write your score first. For example, if you won the match, your scorecard might look like this: 6-3, 4-6, 6-2. That means that you won the first set 6 games to 3; you lost the second set 4 games to 6; and you won the third set 6 games to 2.
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One-sentence summary --
Consider the difference between a game, set, and a match. Know how each game is scored. Know how to call the score when you are serving. Understand how each set is scored. Know that you must always win by two if there is a tie. Know when the match has been won (or lost). Know how to write down the score after the match.