I cut the cords on cable TV a while back...but love to watch Tennis....IS there any Online streaming service just for Tennis I can buy . I got TennisChannelEverywhere, but it was a flop! They offer just WTA and other , not the big 4 events....Also, you need TennisChannel subscription on any Cable providers...sucks!!
You can't get quality for free. Scratch that you can.

Sling TV has a completely free 7 day trial. It has ESPN3 channel in guide which gets you to 1080p feeds of all the matches. watchespn will allow you to use your sling subscribtion to get full ESPN access too including replay of everything. Don't forget to cancel or you'll get charged for a whole month, $20. Make sure you sign up for the package with ESPN.

Rinse and repeat for Wimbledon and US Open.
You are American. Get Private Internet Access or similar for $36 per year. Easy Hide IP has a 7 day trial if you want to test the waters. This allows you to change your IP address so you appear to be in other countries. Great for watching French Open (not on ESPN) with replays on franceTV and Wimbledon(BBC). Probably good for Australia, but I've not tried since I have Sling. For those who are not American this would allow you to sign up for Sling like an American.
The IP thing above will also allow you to sign up for Eurosport player which gets you early Auz events plus three of the majors for about $25 per year (really only necessary if you want the early Auz stuff). Easy to do on PC, but it takes some knowhow to trick the googleplay store and apple stores (fake accounts with British street addresses.) A lof of work for really only a few events.
Use the IP thing with Canadian IP address to watch live on fromhot.com which has better feeds than batmanstream (you can also sign up with betting sights with nominal deposit for similar quality, but not done that.)
The biggest and best investment is Tennis TV for $99 per year. You may be blocked for certain events in certain regions, but you can use the IP thing to switch to a country that is not region blocked (for US events like Houston, Newport, or Citi I switch to UK address and watch them on Tennis TV, otherwise they are blocked.

) This and ESPN give you replays. Eurosportplayer has select replays (cheap bastards.

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Tennis TV is the Cadillac of tennis coverage and much better than any cable package when combined with the above.