WION Sports: Arantxa Sanchez picks her French Open favourites

Three-time French Open champion and former world no. 1 Arantxa Sanchez Vicario analyses the contenders in the men's and women's draws ahead of the year's second grand slam. She thinks Rafael Nadal remains the firm favourite for a twelfth title, and considers defending women's champion Simona Halep as her own biggest threat.