Serena roars into fourth round, tears for Tsonga

By Martyn Herman PARIS (Reuters) - Thunderclaps, rain delays, an inspired home favourite roared on by a partisan crowd -- it was all in a day's work for reigning champion Serena Williams as the world number one roared into the second week of the French Open on Saturday. The 34-year-old American needed all her experience and tenacity to fight off France's Kristina Mladenovic 6-4 7-6(10) in an absorbing contest to set up a last-16 clash with Ukraine's Elina Svitolina who beat 2008 champion Ana Iva