Perhaps, says Peter Bodo on his Tennis.com blog. He raises some good points, such as if you're not a "marketable" player, with lots of endorsement deals, then you must win matches to make money. Contrast that with the $$ MLB players receive ... while some might have incentives, most have nice guaranteed contracts!

Read more at: http://tennisworld.typepad.com/tennisworld/2008/10/money.html.