The lone defenders in these situations are not typically expected to be successful, but by positioning themselves in this manner, it may create doubt in the ball-controlling opposition player as to whether they should shoot themselves or pass to their team mate.
Block the opponents
You can block your opponents runs by placing yourself ahead of them and using your body to prevent him from running past you. This is particularly important for those players who don’t use a small player size.
If all of this fails and you are behind your opponent you have a last chance, there is the slide tackle. You either foul him and risk a red card or you can try to slide just to the side of the opponent and use the LMB or RMB so redirect the ball just enough so your teammates can recover and prevent him from shooting.
1 vs 2
Probably the most dangerous type of situation to be in. In these situations, the lone defender needs to try and slow down the attack as much as possible by positioning themselves half between the passing lane that is open between the two opposition attackers, and the shooting angle that the ball-controlling opposition player has at goal.
As the attackers advance further up the field, the defender will need to start focusing more on closing the shooting angle and allow a passing lane to open up.
A dangerous type of situation you can be in, most players rush in and attempt to tackle the opponent or even try to slide and get red carded. in this scenario your best option is to cover the shooting angle the opponent has on the goal while you wait for a mistake or for a teammate to assist in the defending.
Also consider the position on the pitch when this occurs - if you’re near the halfway line, there is no need to be aggressive in defending as ultimately there is a low risk that the opponent can score from such a position UNLESS the defender makes a mistake and over commits in trying to win the ball early.
1 v 1
Defense is a very important tool to avoid losing, but to win matches you must outscore your rival team. It takes more technical skill and control than defending since you have to actively try to trick and pass through the defender, you often cannot passively wait to score.
You don't need to force a pass
Most new players usually try to force a pass and just do a long ball to the back of the opposite defenders, usually the result is the defender easily gets possession back to his team.
If you are holding the ball and attacking and you don’t see any options ahead, you might look behind to your most defensive players, the defender. Contrary to popular belief the defender can also pass the ball around, just don’t do it if they are under extreme pressure.
Stay alert for runs
Sometimes your teammates manage to successfully trick the defender with their movement and get the upper hand to the goal, always be looking for these kind of situations and quickly deliver the ball to them, either with a chip pass or a power pass so the defender can’t react or catch the ball.
An underrated way to open up space on the field is to “drag” defenders, sometimes you notice that your opponent won’t stop following you. If you are in this scenario you can start moving away from your position opening up that part of the pitch that your teammates can explore, vice-versa if you notice a teammate “dragging” a defender, try to take the space he just created and receive the ball.
Stay alert to the offside line
Especially if you are a defender, always look to your current defensive line and keep in line, do not attempt to defend by running straight towards your own goal - this gives your opponent to much space and will also allow them to exploit the offside rule as the defender who is playing too deep compared to the rest of the team will be playing all of the opponents on side.
There will be times when that is acceptable (Opponent playing a long ball from goal kicks, giving your teammate a passing lane) but most of the time if you just run to your goal to defend you will just help the opposite team.
Likewise as an attacker, don’t run beyond the line of the last opposition defender - this will only reduce the passing options you give to your team mate. If you find yourself advancing too far, hold your run by either putting your cursor on top of your player to stop the run, or move the mouse sideways to your player so you remain in line with the last opposition defender.
Even if you can’t tackle properly you can contribute to your team defense by being smart, preventing their players from reaching goal scoring positions or delaying their attack so one of your teammates can help you cover the attacker.
If everyone on one team tried to pressure and chase the ball, a moderately competent opponent player will be able to avoid the pressure either by dribbling or by passing to his teammate who becomes free as a result of everyone trying to chase after the ball - that’s why formations and tactics exist.
Try to always stay in formation or move accordingly to the situation. For example, helping the teammate with the ball being pressured or moving into space to make a run so your teammate can pass the ball to you.
Respect the formation always. I cannot emphasize this enough, having an organized and solid formation will make your team improve fast.
Even with all these mechanics you don’t have to dominate them all to make a positive contribution to your team.
If you understand how to play as a team and position yourself correctly and make the right (but simple) choices you can make the difference.
A team that refuses to play as a team and keeps on dribbling alone and not transitioning the ball will always lose to a team that understand what they have to do and how their role functions as part of the wider team.
Try to find the right shot
Always try to find a good spot to shoot, the most effective ways to score are diagonal shots, or full power first post shots.
Sometimes defenders give you space purposely so you shoot the ball from positions they know you can’t score, try to abuse this space to play a pass or explore other options instead of falling on the trap and shooting from an impossible angle.