What to include in a tennis betting system?

[gottogethelp]

I've started building a system for betting on tennis and have been reading avidly through these forums and a few other sites for ideas on what to include. I've compiled the following list:

• Matches/games played (for experience, fatigue, match fitness)
• Match/game wins
• H2H record
• In-play stats, e.g. serve, return, break point record etc
• Upset liklihood
• Momentum
• Home advantage
• Elo / Glicko / other rating systems
• Player matchups, e.g. big server vs weak returner, leftie vs rightie etc
• Player specifics, e.g. don't play well in hot weather or at altitude
• Tournament specifics, e.g. faster surface than average
• General news stories, e.g. personal life disruption, potential injury etc
• Sentiment analysis - the forums here included ?

Most of the above can then be further divided by:

• Time period
• Surface
• Tournament
• Rank
• Round

I was wondering if there was anything missing? I'm interested in absolutely anything... from the glaringly obvious right down to something small but usually very useful! Indeed there may be specific views on the importance of the various data points above. Would be great to hear peoples' thoughts...

[Smiles Tennis]

How long is it going to take you to make selections if you are looking at all that info for each player? All the common info is already included in the price. You need to find a way to find an edge, rather than just looking at H2H record etc. 

Also, upset likelihood? How are you going judge that? Just your opinion? a pundit's opinion? the markets opinion? 

A few things to think about.