Before March Madness basketball overwhelms me, Big Shots suffers the heat in Morocco at the 24th Marathon des Sables in the Sahara Desert before cooling off in Croatia at the Synchronized Skating World Championships in Zagreb. Then it's on to Malaysia for the rain-shortened Malaysian Grand Prix before joining Sara Campbell 314 feet under water for her record breaking free dive off the Bahamas. Hold your breath, Big Shots is bringing you March Madness this week on Wednesday after both the men's and women's champions have been crowned. Note for regular Big Shots readers: for the weeks of April 13 and 20 I leave Big Shots in the very capable hands of fellow Globe picture editor Lloyd Young while I'm on vacation. We've got a deep bench. ( 37 photos total