Top-ranked Jannik Sinner stunned in second round of French Open

<p>World No. 1 Jannik Sinner suffers a stunning defeat during the second round at Roland Garros on Thursday. The four-time major winner had his 30-match win streak snapped by Juan Manuel Cerundolo. Eurosport tennis analyst's Mats Wilander and Àlex Corretja break down what happened and how the stifling heat could have played a factor.</p>