Tonic's Martina Hingis signature tennis collection continues to grow. Below is a quick video showcasing some of Hingis' newest Spring 2013 looks as well as a bit of history on the player's stellar career. The new Tonic Spring Flux Adjustable Tank, $69 (with built in soft cup bra) and Spring Swift Skort, $79, are amoung my favorites this season. The shirring on the tank is a flattering touch for those who don't like their performance tops tight around the mid section. Side drawcords can lengthen or shorten the body as well. Find it online at Tennis-Warehouse and Tonic retailers.