I'm a newer better who's had some success in NFL (45ish% profit 2011, 35ish% 2012) with aggressive bet sizing (5-10%), conservative amount of plays, and generally favorite plays ATS with a preference for teases.
I tried tennis out last year with a similar strategy, and it was quite the rollercoaster - up to 75% and down to -10%. Hoping to make a better show of it this year - I want as much experience in different sports so I can feel comfortable looking at lines for all of them when I try to make a go of this, the more lines the more comfortable I'll be only picking ones I really like (theoretically). And yeah, I am airbetting right now. At least until NFL.
For previous history, you can browse through here: http://natesbets.wordpress.com/category/tennis/
And for last year's here: http://natesnfl11betting.blogspot.com
Will do writeups sometimes.
1 unit=200 on those pages=5%
For bets -101 or lower, bets are to win x units
For bets +101 or better, bets are risking x units
Les go