I still check tennis matches and here are phases I found usefull for right prediction
I take all informations from
http://tennis.wettpoint.com/, all player's birth data, all matches they played from the start of professional carrier.
As I do not use horary technique becouse I want to predict all matches starting at the same time, at the same day, at the same place or all tennis matches at the same day, I use player's natal charts and transits. I hope I do not have to explain this. But what misses. The birth time. You have two options if it is unknown. One is to take 12:00 as birth time what can produce lucky guess, but some astrologers uses that way. I have bad expirience so I do not use it. The other way is to do rectification method to get the birth time. Now, I use software JIGSAW not becouse it is the best but it is just correct for me. I think that many astrology software has rectification like option. Choice is yours.
What happened to me when I calculated the main events ( winning matches or tournaments )? I recived information od several 100% birth times. How is it possible? It is and when there are several suggested birth times you must do the same is you got just one 100%. You must check through predictions of several past matches ( try not to see final score at the list of matches , the best way is to ask someone to read from list all data except the score).
That is checking the right birth time. If check fails you leave that player for a while). You must do the same check for as much players as you can. I am sure that at least 20-30 first ranged players will have the right time.
I made a table of first 100 players and have 90 with potentially right birth time. I spent a lot of time (several months) but I do the same as for soccer, many matches to check before definite decision.
Now, when I have all data for both players in the match I make BEWHEEL (inner as natal positions and outer with transit positions of the planets of course). I do not compare who is stronger but whose aspect from natal chart is activated by passing appropriated transit planet. In short this is the whole story. Almost.
As you can se there are no event charts. Yes, sometimes you can predict tennis match with event chart but I think that it is just with enormous quantity of luck. More over I am sure that with horary technique you cannot predict more than one match in several hours. Explanation is simple.