Former No. 1 plays WTT for first time in four years.
The two stars come from different sporting worlds, but joined forces for a unique battle.
A treasure trove of some 70-plus tennis posters will be up for auction.
PlayTennis.com is giving fans a chance to win tickets to this year's US Open event.
Victoria Azarenka will join Bryan Brothers at V-Grid Tennis Fest benefiting the Bryan Bros. Foundation.
The former top 20 player may return at next week's Gstaad event.
Five trophies were handed out on the ATP and WTA last week.
