This is important I found this info on other tennis forum and this what it said
"leftys are probably the hardest opponents you are going to face(like nadal). To beat them, you cannot aim for their forehand which is a right handers backhand, you have to hit it down the line or cross court if you are on the other side to his backhand. you also have to shift your serve return position toward the center of the court if you are returning on the right side of the court, and more to the left if you are on the other side because lefties put left spin on their balls"
I am a lefty so this can be useful for righty