Who's surging and who's sliding after the first mont of the season? The Heat Index has your answer. WTA Insider Senior Writer and Web Editor David Kane weigh on on the hottest players on tour as we debut the Heat Index. Subscribe to the podcast on iTunes, Stitcher, TuneIn or on any podcast app of your choice to ensure you never miss an episode when they go live. Reviews are always helpful, so if you like what you've heard so far, leave us one. You can also get new episode alerts by following us on Twitter @WTA_Insider.