Ex-tennis player Mary Pierce

Four-time Grand Slam champion Mary Pierce knows the significance of running to stay fit, as she's had to do it often while battling an injury-riddled career that promised more but delivered far less. In the country, as international event ambassador of the TCS World 10K run in Bangalore, Pierce, 43, spoke about Serena Williams, Rafael Nadal, Roger Federer and her 2005 Wimbledon mixed doubles-winning partner Mahesh Bhupathi.