Pro tennis player
For all the good Twitter has brought, it's also tripped up several sports figures. Here's a look at some who have let the tweets go a little too far, beginning with the one-time prodigy Young, who wrote, "Fu-- USTA!! Their full of sh--! They have screwed me for the last time!'" after a come-from-ahead loss to 176th-ranked Tim Smyczek in a USTA playoff for a wild card into the 2011 French Open main draw.