Yesterday, I played with him again. I won 6-4, 2-6, 6-4. I tried lots of angles shots on the forehand and backhand(although some shot went straight instead of angle)
. It made him run a lot. He had to run all over the place. When its time for him to serve, he double faulted and started to yell at me saying that his 2nd serve was in. He did also threw his racket in frustration and yell at me saying its distraction when I grunt. I tell him no need to do that as we are just playing tennis for fun and enjoyment. Lol.
Thanks for the advice guyha4. My angle shots is still not that good but I will keep on practising. I think for hard shots I still have long way to go.