losing focus in the zone 3 times

I had a match against the other best player in our group, usually when I play with him it's really tight and sometimes I win and sometime he wins.

The last time I played him I was in the zone and I played such good tennis that he didn't have a chance and very quickly I was up 5-0. He was serving and then he was up 40-15.

I told myself to stay focused and saved two game points but then he took the game. I wasn't frustrated and didn't take it hard. He took the next game and I was still not frustrated but then when he was up 30-0 on the next game I started losing confidence and soon enough it was 5-5.

I took the next game and he took the next game to get to a tie-break. In the tie-break I had 3 match points in a row which I couldn't convert and two more after that which I also couldn't convert. At 9-9 our coach needed the court and told us to play two more points. He got a match point and I saved it.

A match after I played against my brother. I played well and I was in the zone and from 2-2 I went on to take the set 6-2. On the second set I was up 2-0 and then it happened again that I lost focus and he came back to 2-2. From there I got back into the zone and closed the set 6-2.

A match after I played against a girl that I was better than her and lost the first game because I still didn't get my shots going. The next game I was in the zone and went up 5-1 with amazing winners. Then again I lost focus, she took a game and then I closed 6-2.