Business Insider reports tennis icon Serena Williams was forced to retire in the Rogers Cup final.<br />The veteran American played just four games before succumbing to back spasms.<br />That left 19-year-old Bianca Andreescu to win the trophy in front of her hometown fans.<br />Williams broke down in tears when she withdrew from the match, and then again while making her post-match statements.<br />Andreescu wins 1,000 tour level ranking points and will reach a career-high rank of 14 on Monday.
