This Saturday, before the Championships at Wimbledon kick off in London, the 2013 Wimbledon men’s doubles champions are playing an exclusive engagement. The brothers Bob and Mike Bryan, alongside Ana Ivanovic, Stan Wawrinka, and Tomas Berdych, have partnered with Approach, a new specialty travel company that offers tennis fans something new. An event organized by Approach will be held on June 21 at London’s Roehampton Club and will allow a group of up to 42 paying customers (from $6,725 per person) to test the…