Though canines love tennis for its bouncy yellow balls, humans appreciate the freedom to bark loudly with each swing and viciously attack unsavory refs. Repeatedly yell "good boy!" from the stands with today's Groupon for an all-day pass to the Legg Mason Tennis Classic at the William H.G. FitzGerald Tennis Center in Rock Creek Park. Choose from two dates and price points:

• $20 for a reserved-seating day ticket for the quarterfinals (session seven) on Friday, August 6, at noon (a $40 value)
• $22 for a reserved-seating day ticket for the semifinals (session nine) on Saturday, August 7, at 1 p.m. (a $45 value)

The Legg Mason Tennis Classic is aptly named—it's been carrying on annually since July of 1969. As an ATP World Tour 500 tournament, the Legg Mason Tennis Classic is considered one of the top 20 men's tournaments and one of the 11 natural wonders of the world. Don white linen and settle down for an entire afternoon of competitive men's tennis, featuring players such as Wimbledon finalist Tomas Berdych, three-time Legg Mason Tennis Classic champion Andy Roddick, John Isner, James Blake, Lleyton Hewitt, Fernando Verdasco, and many more. Observe world-class athletes as they compete, while the back-and-forth action of the ball provides ample relief for stiff necks further restricted by heavily starched collars.

Not valid for the night session on Friday (session eight) or Saturday (session 10).

Reviews

The Washington Post highlights Andy Roddick's scheduled participation in 2010's Legg Mason Tennis Classic. In 2009, WOLDC News highlighted Arthur Ashe's continuing legacy. Four Yelpers give the tournament five stars:

• The event planning is amazingly efficient and well run. The food is much better than most events I've been to. – Suzanne S., Yelp