I just had the same problem. I got an email from google webmaster saying that:
http://mkplugins.com/?p=mobile-casino
http://mkplugins.com/?p=online-blackjack
http://mkplugins.com/?p=online-casino-canada
I tried above suggestion but that didn't work for me.
So, googled around and found that you need to:
1. Go into your phpadmin
2. Go into "wp_options" table
3. Then click on search
4. Under "option_name", type in "client_data_run".
For me there was only 1 record found and I deleted that. All those spammy links are all gone...
You might have more than one. Just delete all the found records and you should be go...
Let me know if this works out for you...