Microsoft's sent out word that demos for Top Spin 4 and MLB 2K11 are now live to download from Xbox Live Marketplace.
Availability may differ depending on your region - we can't find the MLB 2K11 demo, but have had no trouble accessing the Top Spin 4 one. Demo descriptions follow:
Top Spin 4
Feel the excitement and energy of the US Open as you play in a tie break match to 7 points using some of the world's top pros complete with 2K's Signature Style. Featuring new TV broadcast style presentation & innovative controls that allow gamers of any skill level to dominate the court, Top Spin 4 puts you front and centre of the professional tennis experience.
Begin your quest for perfection on the baseball diamond with the Major League Baseball 2K11 demo, available now for download. Play a three inning game with the San Francisco Giants and Texas Rangers at AT&T Park and get an early taste of 2K11's Revamped Fielding System and improved Total Control Pitching & Hitting. Perfect YOUR game with Major League Baseball 2K11, in stores March 8!