I've gotten a lot of requests on how to deal with close shots that can be in a 1v1 or coming out of the goal..
The main thing is making sure you cut down the striker's angle so that he needs to go through YOU to get into the goal. Most strikers will panic and slow down their attack giving your defense time to get back and cover you.
Make sure you are watching the kicking foot on the striker when you are cutting off the angle, the moment he/she lifts their kick foot you step up and set into your keeper position. Knees bent eyes, feet parralel and your eyes on the ball will get you the fastest and best reaction time while making the save as safe as possible.
PRACTICE PRACTICE PRACTICE
Keep the ball positioned always in the center of your body when you are coming out to attack the ball!